coc·cyx
noun/ˈkɒksɪks/
/ˈkɑːksɪks/
(plural coccyxes, coccyges
(anatomy)/ˈkɒksɪdʒiːz/
/ˈkɑːksɪdʒiːz/
)- the small bone at the bottom of the spine
enlarge image尾骨 Word Originlate 16th cent.: via Latin from Greek kokkux ‘cuckoo’ (because the shape of the human bone resembles the cuckoo's bill).