oaks
"derw" means "oaks" in Welsh (masculine noun). Pronounced /ˈdɛru/. Mutation forms: Treiglad Meddal → dderw, Treiglad Trwynol → nerw.
In Welsh, the first letter of "derw" changes depending on the grammatical context. These are the mutated forms:
| Mutation | Form |
|---|---|
| Base form | derw |
| Treiglad Meddal | dderw |
| Treiglad Trwynol | nerw |
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