• The series of vertebrae forming the axis of the skeleton and protecting the spinal cord (synset 105595824)
  • Any sharply pointed projection (synset 113935854)
  • A small sharp-pointed tip resembling a spike on a stem or leaf (synset 113110391)
  • 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)
  • 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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