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coccyx

noun
🔊/ˈkɒksɪks/
🔊/ˈkɑːksɪks/
(plural coccyxes, coccyges
🔊/ˈkɒksɪdʒiːz/
🔊/ˈkɑːksɪdʒiːz/
)
(anatomy解剖学)
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  1. the small bone at the bottom of the spine尾骨
     synonym tailboneTopics Bodyc2
    Word Originlate 16th cent.: via Latin from Greek kokkux ‘cuckoo’ (because the shape of the human bone resembles the cuckoo's bill).