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spine

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noun
    1. the spinal or vertebral column; backbone
    2. something, as a quality or trait, that constitutes a principal strength; resolution; stamina; backbone: a situation that would test a person's spine
    3. a ridge, as of ground or rock
    [Webster]

More word meanings for spine
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Wiktionary:
spine @ wiktionary
WordNet:
spine @ wordnet.princeton.edu
Merriam-Webster Online:
spine @ M-W.com
MSN Encarta:
spine @ Encarta
American Heritage Dictionary of the English Language:
spine @ AHD provided by Yahoo! Education
Answers.com:
spine @ Answers.com
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