Mewn ieithyddiaeth, morffem a ychwanegir at wreiddyn i fynegi ystyr gramadegol neu darddiadol yw dodiad.
Ni all dodiaid sefyll ar eu pennau eu hunain. Maen nhw felly yn forffemau clymedig. Mae dodiaid yn rhannu'n dri math o leiaf yn ôl eu safle mewn perthynas â'r gwreiddyn:
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