Etymology
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sinus (n.)

"hollow curve or cavity in the body," early 15c., from Medieval Latin sinus, from Latin sinus "bend, fold, curve, a bent surface; a bay, bight, gulf; a fold in land;" also "fold of the toga about the breast," hence "bosom," and figuratively "love, affection, intimacy; interior, inmost part;" of unknown origin.

updated on October 04, 2013

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Definitions of sinus from WordNet

sinus (n.)
an abnormal passage leading from a suppurating cavity to the body surface;
Synonyms: fistula
sinus (n.)
any of various air-filled cavities especially in the bones of the skull;
sinus (n.)
a wide channel containing blood; does not have the coating of an ordinary blood vessel;
Synonyms: venous sinus
From wordnet.princeton.edu, not affiliated with etymonline.