coccyx
noun /ˈkɒksɪks/
/ˈkɑːksɪks/
(plural coccyxes, coccyges
(anatomy) /ˈkɒksɪdʒiːz/
/ˈkɑːksɪdʒiːz/
)- enlarge imagethe small bone at the bottom of the spine synonym tailboneTopics Bodyc2Word Originlate 16th cent.: via Latin from Greek kokkux ‘cuckoo’ (because the shape of the human bone resembles the cuckoo's bill).