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1 definition found
 for sinus
From WordNet (r) 3.0 (2006) :

      n 1: an abnormal passage leading from a suppurating cavity to
           the body surface [syn: fistula, sinus]
      2: any of various air-filled cavities especially in the bones of
         the skull
      3: a wide channel containing blood; does not have the coating of
         an ordinary blood vessel [syn: venous sinus, sinus]

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