Note 2 — Chapter III · Fairy Ways and Words

Trefriw means the town of the slope or hillside, and stands for Tref y Riw, not tref y Rhiw, which would have yielded Treffriw, for there is a tendency in Gwyneđ to make the mutation after the definite article conform to the general rule, and to say y law, ‘the hand,’ and y raw, ‘the spade,’ instead of what would be in books y ỻaw and y rhaw from yr ỻaw and yr rhaw. ↑