in English is:

nephridium

Mutations

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

Use

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