in English is:

ritualism

Mutations

Soft:ddefodaeth
Nasal:nefodaeth
Aspirate:(no mutation)

Use

y ddefodaeth hon
fy nefodaeth i
dy ddefodaeth di
ei ddefodaeth ef/o
ei defodaeth hi
ein defodaeth ni
eich defodaeth chi
eu defodaeth nhw/hwy
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