in English is:

geriatrification

,

senility

Mutations

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

Use

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