in English is:

gerontology

Mutations

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

* This form is an exception to the mutation rules.

Use

y gerontoleg hon
fy ngerontoleg i
dy gerontoleg di
ei gerontoleg ef/o
ei gerontoleg hi
ein gerontoleg ni
eich gerontoleg chi
eu gerontoleg nhw/hwy
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