coccyx

coc·cyx

noun \ˈkäk-siks\

plural coc·cy·ges \ˈkäk-sə-ˌjēz\ also coc·cyx·es \ˈkäk-sik-səz\

Definition of COCCYX

: a small bone that articulates with the sacrum and that usually consists of four fused vertebrae which form the terminus of the spinal column

Illustration of COCCYX