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spine

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spine
spine /spaɪn/ noun
 Date: 1300-1400
 Language: Latin
 Origin: spina

1. [countable] the row of bones down the centre of your back that supports your body and protects your spinal cord
   SYN  backbonespinal
2. [countable] a stiff sharp point on an animal or plant ⇨ spiny:
    cactus spines
3. [countable] the part of a book that the pages are fastened onto
4. [uncountable] courage or determination