in English is:

extinguishing

Mutations

Soft:ddiffoddiad
Nasal:niffoddiad
Aspirate:(no mutation)

Use

y diffoddiad hwn
fy niffoddiad i
dy ddiffoddiad di
ei ddiffoddiad ef/o
ei diffoddiad hi
ein diffoddiad ni
eich diffoddiad chi
eu diffoddiad nhw/hwy
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