Cefn, n. a back; a ridge
Cefnaint, n. a middle part
Cefnant, n. support; a great-grandchild
Cefnbant, a. saddle-backed
Cefnder, Cefnderw, dyrw, n. first cousin
Cefndwn, a. broken backed
Cefnddryll, n. a chine
Cefnen, n. a gently rising hill
Cefnfor, n. the main sea
Cefn-grwba, a. hunch-backed