in English is:

confinement

Mutations

Soft:welyfod
Nasal:ngwelyfod
Aspirate:(no mutation)

Use

y gwelyfod hwn
fy ngwelyfod i
dy welyfod di
ei welyfod ef/o
ei gwelyfod hi
ein gwelyfod ni
eich gwelyfod chi
eu gwelyfod nhw/hwy
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