in English is:

catastrophism

Mutations

Soft:drychinebiaeth
Nasal:nhrychinebiaeth
Aspirate:thrychinebiaeth

Use

y drychinebiaeth hon
fy nhrychinebiaeth i
dy drychinebiaeth di
ei drychinebiaeth ef/o
ei thrychinebiaeth hi
ein trychinebiaeth ni
eich trychinebiaeth chi
eu trychinebiaeth nhw/hwy
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