in English is:

corrosion

Mutations

Soft:gyrydiad
Nasal:nghyrydiad
Aspirate:chyrydiad

Use

y cyrydiad hwn
fy nghyrydiad i
dy gyrydiad di
ei gyrydiad ef/o
ei chyrydiad hi
ein cyrydiad ni
eich cyrydiad chi
eu cyrydiad nhw/hwy
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