Backbone
/bˈæˌkboʊn/
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Definition
(noun) The series of vertebrae, separated by disks, that encloses and protects the spinal cord, and runs down the middle of the back in vertebrate animals.
Sentence Examples
Will he have the backbone to speak out against the bill?
He is an American to the backbone.
CEFR Practice Quiz
The ____ provides support for the body and protects the spinal cord.