Cynnyrchiol, a. productive
Cynnyrchioldeb, n. productiveness
Cynnyrchioli, v. to make productive; to become productive
Cynnyrchu, v. to increase
Cynnysgaeth, n. portion, fortune
Cynnysgaethiad, n. endowment, a settling, a fortune
Cynnysgaethu, v. to endow
Cynoes, n. first age, antiquity
Cynoesol, a. primevous
Cynosod, v. to prepose