Noun
cywydd (plural cywyddau)
(poetry) A Welsh verse form consisting of rhyming couplets written in cynghanedd.
L.W. MSS. 695) *Gwilym Gwyn (fl. c. 1560–1600) – whose surviving work includes a cywydd to St. Elian Geimiad. Source: Internet
He was an innovative poet who was responsible for popularising the metre known as the " cywydd " and first to use it for praise. Source: Internet