De-base, iselu, iselhau, gwaethygu

De-bate, dadl; ymresymiad: dadlu

De-bauch, llygru, halogi, gloddesta

Deb-it, dyled: dyledu

Debt-or, dyledwr; dyledog

De-camp, dadwersyllu; cilio, ffoi

De-cay, dadfail; gwendid: dadfeilio; gwanhau

De-cease, marwolaeth, ymadawiad: marw

De-ceit, twyll, hoced, ffalsedd, dichell

De-ceive, twyllo, hudo, siomi