Cleddyfyddiaeth, n. swordsmanship
Clefri, n. the leprosy
Clefryd, n. erruptive disease
Clefwch, n. disease, ailment
Clefychlyd, a. sickly
Clefychu, v. to fall sick
Clefyd, n. fever, sickness
Clefydog, a. liable to sickness
Clegyr, n. cliff, rock
Clegyrog, a. rugged, rocky