Gwrthwng, n. a contrary oath, a counter swearing
Gwrthdwyth, a springing back; elasticity
Gwrthdynu, v. to pull adversely
Gwrthdyst, n. counter evidence
Gwrthdywyn, reflection of light
Gwrthddadl, n. a controversy
Gwrthddadleuwr, n. a controvertist
Gwrthddangos, n. contra-indication
Gwrthddal, n. a with-holding
Gwrthddrych, n. an object