sinus - definition, thesaurus and related words from WordNet-Online

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Noun sinus has 3 senses

fistula, sinus - an abnormal passage leading from a suppurating cavity to the body surface
--₁ is a kind of passage, passageway
sinus - any of various air-filled cavities especially in the bones of the skull
--₂ is a kind of cavity, bodily cavity, cavum
--₂ has particulars:
ethmoid sinus, ethmoidal sinus, sinus ethmoidales; frontal sinus; maxillary sinus; paranasal sinus, sinus paranasales, nasal sinus
venous sinus, sinus - a wide channel containing blood; does not have the coating of an ordinary blood vessel
--₃ is a kind of duct, epithelial duct, canal, channel
--₃ has particulars:
cavernous sinus, sinus cavernosus; coronary sinus, sinus coronarius; sigmoid sinus, sinus sigmoideus; straight sinus, tentorial sinus, sinus rectus; transverse sinus, sinus transversus