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backbone

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backbone/ˈbækˌboʊn/noun
pluralbackbones
backbone
/ˈbækˌboʊn/
noun
pluralbackbones
Learner's definition of BACKBONE  
[count] : the row of connected bones that go down the middle of the back and protect the spinal cord
— see picture at human
— called also spinal columnspine
[count] : the most important or strongest part of something
[noncount] : strength and courage
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