in English is:

astrology

Mutations

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

Use

y sêr-ddewiniaeth hon
fy sêr-ddewiniaeth i
dy sêr-ddewiniaeth di
ei sêr-ddewiniaeth ef/o
ei sêr-ddewiniaeth hi
ein sêr-ddewiniaeth ni
eich sêr-ddewiniaeth chi
eu sêr-ddewiniaeth nhw/hwy
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