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Noun: sinus  sI-nus
  1. An abnormal passage leading from a suppurating cavity to the body surface
    "The doctor needed to drain the infected sinus";
    - fistula
     
  2. Any of various air-filled cavities especially in the bones of the skull
    "Sinus infections can cause facial pain and pressure"
     
  3. A wide channel containing blood; does not have the coating of an ordinary blood vessel
    "Venous sinuses in the brain drain blood from the organ";
    - venous sinus

Derived forms: sinuses

Type of: bodily cavity, canal, cavity, cavum, channel, duct, epithelial duct, passage, passageway

Encyclopedia: Sinus