Welsh /ˈwɛlʃ/adjective 4noun 2phrases 1 adjective4 •Of or pertaining to Wales. •Of or pertaining to the Celtic language of Wales. •Designating plants or animals from or associated with Wales. •(historical) Indigenously British; pertaining to the Celtic peoples who inhabited much of Britain before the Roman occupation.The Tudors, it was argued, were of Welsh or ancient British descent. — 1985 noun2 •[in the plural] The people of Wales. •A breed of pig, kept mainly for bacon. Phrases with Welsh Welsh combOne's fingers, used as an improvised method to straighten one's hair.