Definition of spine noun from the Oxford Advanced American Dictionary

     

    spine

     noun
    noun
    NAmE//spaɪn//
     
     
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  1. 1the row of small bones that are connected together down the middle of the back synonym backbone
  2. 2any of the sharp pointed parts like needles on some plants and animals Porcupines use their spines to protect themselves. see also spiny
  3. 3the narrow part of the cover of a book that the pages are joined to
See the Oxford Advanced Learner's Dictionary entry: spine