cur
"costog" means "cur" in Welsh (masculine noun). Mutation forms: Treiglad Meddal → gostog, Treiglad Trwynol → nghostog, Treiglad Llaes → chostog.
In Welsh, the first letter of "costog" changes depending on the grammatical context. These are the mutated forms:
| Mutation | Form |
|---|---|
| Base form | costog |
| Treiglad Meddal | gostog |
| Treiglad Trwynol | nghostog |
| Treiglad Llaes | chostog |
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