coccygeal coc·cyg·e·al (kŏk-sĭj'ē-əl)
adj.
Relating to the coccyx.
coccyx coc·cyx (kŏk'sĭks)
n. pl. coc·cy·ges (kŏk-sī'jēz, kŏk'sĭ-jēz')
The small triangular bone located at the base of the spinal column, formed by the fusion of four rudimentary vertebrae, and articulating above with the sacrum. Also called tailbone.