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Pronunciation: si'nus, -ez


  1. A channel for the passage of blood or lymph, without the coats of an ordinary vessel; blood passages in the gravid uterus or those in the cerebral meninges.
  2. A cavity or hollow space in bone or other tissue.
  3. A dilation in a blood vessel.
  4. A fistula or tract leading to a suppurating cavity.

[L. sinus, cavity, channel, hollow]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.