Pronunciation: (kok'siks), [key]
—pl. coc•cy•gesPronunciation: (kok-sī'jēz, kok'si-jēz"). [key]
1. a small triangular bone forming the lower extremity of the spinal column in humans, consisting of four ankylosed rudimentary vertebrae. See diag. under spinal column.
2. a corresponding part in certain animals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.