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backbone [backbones]▼(series of vertebrae that encloses the spinal cord)noun[UK: ˈbæk.bəʊn] [US: ˈbækˌboʊn]
spine [spines]▼(rigid, pointed surface protuberance or needle-like structure)noun[UK: spaɪn] [US: ˈspaɪn]
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