/ Dictionary / Index C coccyx: Meaning and Definition of Find definitions for: coc•cyx Pronunciation: (kok'siks), [key] — pl. coc•cy•ges a small triangular bone forming the lower extremity of the spinal column in humans, consisting of four ankylosed rudimentary vertebrae. See diag. under a corresponding part in certain animals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coccyx (Thesaurus) coccus coch. Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language