in English is:

desiccation

Mutations

Soft:ddysychiad
Nasal:nysychiad
Aspirate:(no mutation)

Use

y dysychiad hwn
fy nysychiad i
dy ddysychiad di
ei ddysychiad ef/o
ei dysychiad hi
ein dysychiad ni
eich dysychiad chi
eu dysychiad nhw/hwy
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