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

 

whalebone

 noun
noun
BrE BrE//ˈweɪlbəʊn//
 
; NAmE NAmE//ˈweɪlboʊn//
 
[uncountable]
 
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a thin hard substance found in the upper jaw of some types of whale, used in the past to make some clothes stiffer
See the Oxford Advanced American Dictionary entry: whalebone