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breastbone

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breastbone/ˈbrɛstˌboʊn/noun
pluralbreastbones
breastbone
/ˈbrɛstˌboʊn/
noun
pluralbreastbones
Learner's definition of BREASTBONE  
[count]
: a flat, narrow bone in the middle of the chest to which the ribs are connected
— see picture at human
— called also sternum
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