Definition of tailbone noun from the Oxford Advanced Learner's Dictionary

 

tailbone

 noun
noun
BrE BrE//ˈteɪlbəʊn//
 
; NAmE NAmE//ˈteɪlboʊn//
 
Skeleton and muscles
 
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the small bone at the bottom of the spine synonym coccyx See related entries: Skeleton and muscles
See the Oxford Advanced American Dictionary entry: tailbone