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Define the word dorsum

"Dorsum" gcide "The Collaborative International Dictionary of English v.0.48"

Dorsum \Dor"sum\, n. [L.]
   1. The ridge of a hill.
      [1913 Webster]

   2. (Anat.) The back or dorsal region of an animal; the upper
      side of an appendage or part; as, the dorsum of the
      tongue. Dortour

"dorsum" wn "WordNet (r) 2.0"

dorsum
     n 1: the posterior part of a human (or animal) body from the neck
          to the end of the spine; "his back was nicely tanned"
          [syn: back]
     2: the back of the body of a vertebrate or any analogous
        surface (as the upper or outer surface of an organ or
        appendage or part); "the dorsum of the foot"
     [also: dorsa (pl)]