Cydlif, n. a conflux
Cydlyniad, n. a cohesion
Cydnabod, n. aquaintance, recognition
Cydnabyddiaeth, n. aquaintance
Cydnabyddus, a. aquainted together; expert
Cydnad, n. conclamation
Cydnaid, n. a joint leap
Cydnaws, a. connatural
Cydnerth, n. equipollence
Cydnesu, to approach mutually