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type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toglo'r tabl cynnwys" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toglo'r tabl cynnwys</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Yr wyddor Gymraeg</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ewch i erthygl mewn iaith arall. Ar gael mewn 7 iaith" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-7" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">7 iaith</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-de badge-Q70894304 mw-list-item" title=""><a href="https://de.wikipedia.org/wiki/Walisisches_Alphabet" title="Walisisches Alphabet - Almaeneg" lang="de" hreflang="de" data-title="Walisisches Alphabet" data-language-autonym="Deutsch" data-language-local-name="Almaeneg" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Alphabet_gallois" title="Alphabet gallois - Ffrangeg" lang="fr" hreflang="fr" data-title="Alphabet gallois" data-language-autonym="Français" data-language-local-name="Ffrangeg" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Walesi_%C3%A1b%C3%A9c%C3%A9" title="Walesi ábécé - Hwngareg" lang="hu" hreflang="hu" data-title="Walesi ábécé" data-language-autonym="Magyar" data-language-local-name="Hwngareg" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Alphabetum_Cambricum" title="Alphabetum Cambricum - Lladin" lang="la" hreflang="la" data-title="Alphabetum Cambricum" data-language-autonym="Latina" data-language-local-name="Lladin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%92%D0%B5%D0%BB%D1%88%D0%BA%D0%B0_%D0%B0%D0%B7%D0%B1%D1%83%D0%BA%D0%B0" title="Велшка азбука - Macedoneg" lang="mk" hreflang="mk" data-title="Велшка азбука" data-language-autonym="Македонски" data-language-local-name="Macedoneg" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Alfabet_walijski" title="Alfabet walijski - Pwyleg" lang="pl" hreflang="pl" data-title="Alfabet walijski" data-language-autonym="Polski" data-language-local-name="Pwyleg" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%90%D0%BB%D0%B8%D1%84%D0%B1%D0%BE%D0%B8_%D1%83%D1%8D%D0%BB%D1%81%D3%A3" title="Алифбои уэлсӣ - Tajiceg" lang="tg" hreflang="tg" data-title="Алифбои уэлсӣ" data-language-autonym="Тоҷикӣ" data-language-local-name="Tajiceg" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1058862#sitelinks-wikipedia" title="Golygu dolenni rhyngwici" class="wbc-editpage">Golygu dolenni</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Parthau"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Yr_wyddor_Gymraeg" title="Gweld y dudalen bwnc [c]" accesskey="c"><span>Erthygl</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Sgwrs:Yr_wyddor_Gymraeg" rel="discussion" title="Sgwrsio am y dudalen [t]" accesskey="t"><span>Sgwrs</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Newid amrywiad iaith" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Cymraeg</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Golygon"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Yr_wyddor_Gymraeg"><span>Darllen</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&veaction=edit" title="Golygu'r dudalen hon [v]" accesskey="v"><span>Golygu</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=edit" title="Golygu cod ffynhonnell y dudalen hon [e]" accesskey="e"><span>Golygu cod</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=history" title="Fersiynau cynt o'r dudalen hon. [h]" accesskey="h"><span>Gweld hanes</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Offer tudalen"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Blwch offer" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Blwch offer</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Blwch offer</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">symud i'r bar ochr</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">cuddio</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Rhagor o opsiynau" > <div class="vector-menu-heading"> Gweithredoedd </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/Yr_wyddor_Gymraeg"><span>Darllen</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&veaction=edit" title="Golygu'r dudalen hon [v]" accesskey="v"><span>Golygu</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=edit" title="Golygu cod ffynhonnell y dudalen hon [e]" accesskey="e"><span>Golygu cod</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=history"><span>Gweld hanes</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Cyffredinol </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Arbennig:WhatLinksHere/Yr_wyddor_Gymraeg" title="Rhestr o bob tudalen sy'n cysylltu â hon [j]" accesskey="j"><span>Beth sy'n cysylltu yma</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Arbennig:RecentChangesLinked/Yr_wyddor_Gymraeg" rel="nofollow" title="Newidiadau diweddar i dudalennau sydd yn cysylltu â hon [k]" accesskey="k"><span>Newidiadau perthnasol</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&oldid=13254446" title="Dolen barhaol i'r fersiwn hwn y dudalen hon"><span>Dolen barhaol</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=info" title="Mwy o wybodaeth am y dudalen hon"><span>Gwybodaeth am y dudalen</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Arbennig:CiteThisPage&page=Yr_wyddor_Gymraeg&id=13254446&wpFormIdentifier=titleform" title="Gwybodaeth ar sut i gyfeirio at y dudalen hon"><span>Cyfeirio at y dudalen hon</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Arbennig:UrlShortener&url=https%3A%2F%2Fcy.wikipedia.org%2Fwiki%2FYr_wyddor_Gymraeg"><span>Cael URL byr</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Arbennig:QrCode&url=https%3A%2F%2Fcy.wikipedia.org%2Fwiki%2FYr_wyddor_Gymraeg"><span>Lawrlwytho cod QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Argraffu / allforio </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Arbennig:Book&bookcmd=book_creator&referer=Yr+wyddor+Gymraeg"><span>Llunio llyfr</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Arbennig:DownloadAsPdf&page=Yr_wyddor_Gymraeg&action=show-download-screen"><span>Lawrlwytho fel PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=Yr_wyddor_Gymraeg&printable=yes" title="Cynhyrchwch fersiwn o'r dudalen yn barod at ei hargraffu [p]" accesskey="p"><span>Fersiwn argraffu</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> Mewn prosiectau eraill </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1058862" title="Cysylltu i eitem ystorfa gysylltiedig [g]" accesskey="g"><span>Eitem Wicidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Offer tudalen"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Gwedd"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Gwedd</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">symud i'r bar ochr</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">cuddio</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Oddi ar Wicipedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="cy" dir="ltr"><div class="thumb tmulti tright"><div class="thumbinner" style="width:408px;max-width:408px"><div class="tsingle" style="float:left;margin:1px;width:202px;max-width:202px"><div class="thumbimage"><span typeof="mw:File"><a href="/wiki/Delwedd:Welsh_Alphabet_Card_C19th.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Welsh_Alphabet_Card_C19th.jpg/200px-Welsh_Alphabet_Card_C19th.jpg" decoding="async" width="200" height="261" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Welsh_Alphabet_Card_C19th.jpg/300px-Welsh_Alphabet_Card_C19th.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Welsh_Alphabet_Card_C19th.jpg/400px-Welsh_Alphabet_Card_C19th.jpg 2x" data-file-width="558" data-file-height="729" /></a></span></div><div class="thumbcaption" style="clear:left">Cerdyn yr wyddor Gymraeg o'r 19g, sy'n dangos y priflythrennau.</div></div><div class="tsingle" style="float:left;margin:1px;width:202px;max-width:202px"><div class="thumbimage"><span typeof="mw:File"><a href="/wiki/Delwedd:Welsh_alphabet_card_italic_C19th.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Welsh_alphabet_card_italic_C19th.jpg/200px-Welsh_alphabet_card_italic_C19th.jpg" decoding="async" width="200" height="255" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Welsh_alphabet_card_italic_C19th.jpg/300px-Welsh_alphabet_card_italic_C19th.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Welsh_alphabet_card_italic_C19th.jpg/400px-Welsh_alphabet_card_italic_C19th.jpg 2x" data-file-width="481" data-file-height="613" /></a></span></div><div class="thumbcaption" style="clear:left">Cerdyn sy'n dangos y llythrennau bychain, y <a href="/w/index.php?title=Llythrennau_italaidd&action=edit&redlink=1" class="new" title="Llythrennau italaidd (nid yw'r dudalen yn bodoli)">llythrennau italaidd</a>, yr wyddor blith-draphlith, y llafariaid, a'r cytseiniaid.</div></div><div style="clear:left"></div></div></div> <p>Ffurf ar <a href="/wiki/Yr_wyddor_Ladin" title="Yr wyddor Ladin">yr wyddor Ladin</a> a ddefnyddir i ysgrifennu'r iaith <a href="/wiki/Cymraeg" title="Cymraeg">Gymraeg</a> yw'r <b>wyddor Gymraeg</b>. Mae ganddi 28 o <a href="/wiki/Llythyren" title="Llythyren">lythrennau</a>, fel a ganlyn: </p> <table class="wikitable" style="text-align: center"> <tbody><tr> <th colspan="28">Priflythrennau </th></tr> <tr> <td style="width: 24px; height: 24px"><a href="/wiki/A" title="A">A</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/B" title="B">B</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/C" title="C">C</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Ch" title="Ch">Ch</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/D" title="D">D</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Dd" title="Dd">Dd</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/E" title="E">E</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/F" title="F">F</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Ff" title="Ff">Ff</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/G" title="G">G</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Ng" title="Ng">Ng</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/H" title="H">H</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/I" title="I">I</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/L" title="L">L</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Ll" title="Ll">Ll</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/M" title="M">M</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/N" title="N">N</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/O" title="O">O</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/P" title="P">P</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Ph" title="Ph">Ph</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/R" title="R">R</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Rh" title="Rh">Rh</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/S" title="S">S</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/T" title="T">T</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Th" title="Th">Th</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/U" title="U">U</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/W" title="W">W</a> </td> <td style="width: 24px; height: 24px"><a href="/wiki/Y" title="Y">Y</a> </td></tr> <tr> <th colspan="28">Llythrennau bychain </th></tr> <tr> <td style="width: 24px; height: 24px">a </td> <td style="width: 24px; height: 24px">b </td> <td style="width: 24px; height: 24px">c </td> <td style="width: 24px; height: 24px">ch </td> <td style="width: 24px; height: 24px">d </td> <td style="width: 24px; height: 24px">dd </td> <td style="width: 24px; height: 24px">e </td> <td style="width: 24px; height: 24px">f </td> <td style="width: 24px; height: 24px">ff </td> <td style="width: 24px; height: 24px">g </td> <td style="width: 24px; height: 24px">ng </td> <td style="width: 24px; height: 24px">h </td> <td style="width: 24px; height: 24px">i </td> <td style="width: 24px; height: 24px">l </td> <td style="width: 24px; height: 24px">ll </td> <td style="width: 24px; height: 24px">m </td> <td style="width: 24px; height: 24px">n </td> <td style="width: 24px; height: 24px">o </td> <td style="width: 24px; height: 24px">p </td> <td style="width: 24px; height: 24px">ph </td> <td style="width: 24px; height: 24px">r </td> <td style="width: 24px; height: 24px">rh </td> <td style="width: 24px; height: 24px">s </td> <td style="width: 24px; height: 24px">t </td> <td style="width: 24px; height: 24px">th </td> <td style="width: 24px; height: 24px">u </td> <td style="width: 24px; height: 24px">w </td> <td style="width: 24px; height: 24px">y </td></tr></tbody></table> <p>Erbyn heddiw cydnabyddir <b><a href="/wiki/J" title="J">j</a></b> hefyd yn llythyren yr wyddor gan lawer o ramadegwyr. Fe'i defnyddir mewn <a href="/wiki/Benthyg_geiriau_i%27r_Gymraeg" title="Benthyg geiriau i'r Gymraeg">geiriau benthyg</a>. </p><p>Defnyddir <b>k</b> a <b>z</b> mewn geiriau megis <i>Kantaidd</i> a <i>Zwinglïaidd</i> sy'n seiliedig ar enw person<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>, ond ni chânt eu cyfri fel rhan o'r wyddor Gymraeg fel arfer. </p><p>Mae <b>a</b>, <b>e</b>, <b>i</b>, <b>o</b>, <b>u</b>, <b>w</b>, <b>y</b> yn <a href="/wiki/Llafariad" title="Llafariad">llafariaid</a>. Gall <b>i</b> ac <b>w</b> fod yn <a href="/wiki/Cytsain" title="Cytsain">gytseiniaid</a> hefyd megis yn <i>iâ</i> neu <i>galwad</i>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Ynganiad">Ynganiad</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&veaction=edit&section=1" title="Golygu'r adran: Ynganiad" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=edit&section=1" title="Edit section's source code: Ynganiad"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable"> <tbody><tr> <th>Llythyren </th> <th>Enw'r llythyren </th> <th>Seiniau cyfatebol (<a href="/wiki/IPA" class="mw-redirect" title="IPA">IPA</a>) </th></tr> <tr> <td>a </td> <td><i>a</i> </td> <td>/a, ɑː/ </td></tr> <tr> <td>b </td> <td><i>bi</i> </td> <td>/b/ </td></tr> <tr> <td>c </td> <td><i>èc</i> </td> <td>/k/ </td></tr> <tr> <td>ch </td> <td><i>èch</i> </td> <td>/x/ </td></tr> <tr> <td>d </td> <td><i>di</i> </td> <td>/d/ </td></tr> <tr> <td>dd </td> <td><i>èdd</i> </td> <td>/ð/ </td></tr> <tr> <td>e </td> <td><i>e</i> </td> <td>/ɛ, ɛː/ </td></tr> <tr> <td>f </td> <td><i>èf</i> </td> <td>/v/ </td></tr> <tr> <td>ff </td> <td><i>èff</i> </td> <td>/f/ </td></tr> <tr> <td>g </td> <td><i>èg</i> </td> <td>/g/ </td></tr> <tr> <td>ng </td> <td><i>èng</i> </td> <td>/ŋ/ </td></tr> <tr> <td>h </td> <td><i>âets</i>, <i>hâ</i> </td> <td>/h/ </td></tr> <tr> <td>i </td> <td><i>i</i> </td> <td>/ɪ, iː, j/ </td></tr> <tr> <td>l </td> <td><i>èl</i> </td> <td>/l/ </td></tr> <tr> <td>ll </td> <td><i>ell</i> </td> <td>/ɬ/ </td></tr> <tr> <td>m </td> <td><i>èm</i> </td> <td>/m/ </td></tr> <tr> <td>n </td> <td><i>en</i> </td> <td>/n/ </td></tr> <tr> <td>o </td> <td><i>o</i> </td> <td>/ɔ, oː/ </td></tr> <tr> <td>p </td> <td><i>pi</i> </td> <td>/p/ </td></tr> <tr> <td>ph </td> <td><i>ffi</i> </td> <td>/f/ </td></tr> <tr> <td>r </td> <td><i>èr</i> </td> <td>/r/ </td></tr> <tr> <td>rh </td> <td><i>rhi</i>, <i>rho</i> </td> <td>/r̥/ </td></tr> <tr> <td>s </td> <td><i>ès</i> </td> <td>/s/ </td></tr> <tr> <td>t </td> <td><i>ti</i> </td> <td>/t/ </td></tr> <tr> <td>th </td> <td><i>èth</i> </td> <td>/θ/ </td></tr> <tr> <td>u </td> <td><i>u</i> </td> <td>/ɨ̞, ɨː/ (Gogledd), /ɪ, iː/ (De) </td></tr> <tr> <td>w </td> <td><i>w</i> </td> <td>/ʊ, uː, w/ </td></tr> <tr> <td>y </td> <td><i>y</i> </td> <td>/ə, ɨ̞, ɨː/ (Gogledd), /ə, ɪ, iː/ (De) </td></tr></tbody></table> <p>Mae llawer erbyn hyn yn galw'r cytseiniaid yn "bỳ," "cỳ," "ch," ac yn y blaen yn hytrach na defnyddio'r enwau traddodiadol. </p> <div class="mw-heading mw-heading2"><h2 id="Gweler_hefyd">Gweler hefyd</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&veaction=edit&section=2" title="Golygu'r adran: Gweler hefyd" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=edit&section=2" title="Edit section's source code: Gweler hefyd"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Orgraff_y_Gymraeg" title="Orgraff y Gymraeg">Orgraff y Gymraeg</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Llyfryddiaeth">Llyfryddiaeth</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&veaction=edit&section=3" title="Golygu'r adran: Llyfryddiaeth" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=edit&section=3" title="Edit section's source code: Llyfryddiaeth"><span>golygu cod</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Am ragarweiniad i hanes yr wyddor Gymraeg yn y cyfnod modern, o oes y <a href="/wiki/Dadeni" class="mw-redirect" title="Dadeni">Dadeni</a> ymlaen, ynghyd â'r rheolau sillafu safonol a dderbynir heddiw, gweler, </p> <ul><li><a href="/wiki/John_Morris-Jones" title="John Morris-Jones">John Morris-Jones</a> <i>et al.</i>, <i>Orgraff yr Iaith Gymraeg</i> (Adroddiad Pwyllgor Llên Bwrdd Gwybodau Celtaidd Prifysgol Cymru) (Caerdydd, 1928)</li></ul> <div class="mw-heading mw-heading2"><h2 id="Cyfeiriadau">Cyfeiriadau</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&veaction=edit&section=4" title="Golygu'r adran: Cyfeiriadau" class="mw-editsection-visualeditor"><span>golygu</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Yr_wyddor_Gymraeg&action=edit&section=4" title="Edit section's source code: Cyfeiriadau"><span>golygu cod</span></a><span 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