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Definition: Ffurf gysefin ar air fel y'i defnyddid fel cofnod mewn geiriadur, er mwyn cynrychioli pa ffurf bosibl arall. Er enghraifft, 'cysgu' yw lema 'cysgais', 'chysgodd, 'gwsg' ac ati. Gweler hefyd 'bôn'.
