Definition of coccyx noun from the Oxford Advanced American Dictionary

 

coccyx

 noun
noun
NAmE//ˈkɑksɪks//
 
(pl. coccyges
NAmE//ˈkɑksədʒiz//
 
or coccyxes)
(anatomy)
 
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the small bone at the bottom of the spine synonym tailbone
See the Oxford Advanced Learner's Dictionary entry: coccyx