in English is:

radiation

,

radioactivity

Mutations

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

Use

yr ymbelydredd hwn
fy ymbelydredd i
dy ymbelydredd di
ei ymbelydredd ef/o
ei hymbelydredd hi
ein hymbelydredd ni
eich ymbelydredd chi
eu hymbelydredd nhw/hwy
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