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Synonyms
spine (spīn)

[Middle English, from Old French espine, from Latin spīna.]

noun 

  1. The spinal column of a vertebrate.
  2. Zoology Any of various pointed projections, processes, or appendages of animals.
  3. Botany A strong, sharp-pointed, usually woody outgrowth from a stem or leaf; a thorn.
  4. Something that resembles or suggests a backbone, as:
    1. The hinged back of a book.
    2. The crest of a ridge.
  5. Strength of character; courage or willpower.