1. The series of vertebrae forming the axis of the skeleton and protecting the spinal cord (synset 105595824)
    "the fall broke his back"
  2. Any sharply pointed projection (synset 113935854)
  3. A small sharp-pointed tip resembling a spike on a stem or leaf (synset 113110391)
  4. The part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved (synset 104285118)
    "the title and author were printed on the spine of the book"
  5. A sharp rigid animal process or appendage;
    As a porcupine quill or a ridge on a bone or a ray of a fish fin (synset 101903129)

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