to observe
"arsyllu" means "to observe" in Welsh (verb). Mutation forms: Treiglad Llaes → harsyllu.
In Welsh, the first letter of "arsyllu" changes depending on the grammatical context. These are the mutated forms:
| Mutation | Form |
|---|---|
| Base form | arsyllu |
| Treiglad Llaes | harsyllu |
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