in English is:

bigamy

Mutations

Soft:ddwywreigiaeth
Nasal:nwywreigiaeth
Aspirate:(no mutation)

Use

y ddwywreigiaeth hon
fy nwywreigiaeth i
dy ddwywreigiaeth di
ei ddwywreigiaeth ef/o
ei dwywreigiaeth hi
ein dwywreigiaeth ni
eich dwywreigiaeth chi
eu dwywreigiaeth nhw/hwy
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