Of, relating to, or designating the Brittonic language of Wales (see sense B. 1a); (of literary compositions, speeches, etc.) written or spoken…

Of or relating to any of the Brittonic languages spoken by the Celtic inhabitants of Britain. Later: spec. Welsh; (occasionally) Cornish.

(a) n. the Brittonic language of Wales; = Cymraeg, n. (b) adj. designating the Brittonic language of Wales; of or in this language; = sense A. 4.

Of or relating to Powys, its inhabitants, or the dialect of Welsh spoken there.