in English is:

duterium

Mutations

Soft:ddiwteriwm
Nasal:niwteriwm
Aspirate:(no mutation)

Use

y diwteriwm hwn
fy niwteriwm i
dy ddiwteriwm di
ei ddiwteriwm ef/o
ei diwteriwm hi
ein diwteriwm ni
eich diwteriwm chi
eu diwteriwm nhw/hwy
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