abbreviation of datblygiad
"dtb." means "abbreviation of datblygiad" in Welsh (adjective). Mutation forms: Treiglad Meddal → ddtb., Treiglad Trwynol → ntb..
In Welsh, the first letter of "dtb." changes depending on the grammatical context. These are the mutated forms:
| Mutation | Form |
|---|---|
| Base form | dtb. |
| Treiglad Meddal | ddtb. |
| Treiglad Trwynol | ntb. |
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