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Definitions of sinus
  1. noun
    a wide channel containing blood; does not have the coating of an ordinary blood vessel

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  2. noun
    an abnormal passage leading from a suppurating cavity to the body surface

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  3. noun
    any of various air-filled cavities especially in the bones of the skull
Definition that contains sinus
  • ac an electric current that reverses direction sinusoidally
  • cavity (anatomy) a natural hollow or sinus within the body
  • erectile filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood
  • cavernous filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood
  • sinusitis inflammation of one of the paranasal sinuses
  • cavum (anatomy) a natural hollow or sinus within the body
  • cavernous sinus either of a pair of large venous sinuses in the cranial cavity
  • emissary vein one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull
  • straight sinus an unpaired sinus of the dura mater
  • sigmoid sinus an S-shaped dural sinus on the temporal and occipital bones
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