Noun
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any of various air-filled cavities especially in the bones of the skull
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bodily cavity,
cavum,
cavity (anatomy) a natural hollow or sinus within the body
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ethmoid sinus,
ethmoidal sinus,
sinus ethmoidales a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
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frontal sinus one of a pair of cavities in the frontal bone
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maxillary sinus one of a pair of sinuses forming a cavity in the maxilla
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| sinus -
a wide channel containing blood; does not have the coating of an ordinary blood vessel
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venous sinus |
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epithelial duct,
canal,
duct,
channel long and narrow strip of water made for boats or for irrigation
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cavernous sinus,
sinus cavernosus either of a pair of large venous sinuses in the cranial cavity
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coronary sinus,
sinus coronarius a short sinus receiving most of the veins of the heart; empties into the right atrium
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sigmoid sinus,
sinus sigmoideus an S-shaped dural sinus on the temporal and occipital bones
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sinus rectus,
straight sinus,
tentorial sinus an unpaired sinus of the dura mater
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| sinus -
an abnormal passage leading from a suppurating cavity to the body surface
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fistula |
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passageway,
passage a passage between rooms or between buildings
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