backbone

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