I don't know what 'Gari' means but I have to correct what Dave said. A
feminine noun mutates after the definite article and it also causes mutation
to any adjectives after it, however in the example given here 'Rhyd y Gari'
the definite article has nothing to do with 'Rhyd' but rather with 'Gari'
which could be 'Cari' if it is a mangled feminine noun. Neither Cari nor
Gari are recorded in the University of Wales Welsh dictionary. It would be
interesting to know what it does mean, although I personally doubt that it
is from 'Caer' as I doubt that 'ae' would have turned to 'a' in Anglesey
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