Noun: sinus sI-nus
- An abnormal passage leading from a suppurating cavity to the body surface
"The doctor needed to drain the infected sinus";
- fistula
- Any of various air-filled cavities especially in the bones of the skull
"Sinus infections can cause facial pain and pressure"
- 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