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

tailbone

noun
 
/ˈteɪlbəʊn/
 
/ˈteɪlbəʊn/
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  1. the small bone at the bottom of the spine synonym coccyxTopics Bodyc2
See tailbone in the Oxford Advanced American Dictionary
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adjective
 
 
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