sinus
1. [ noun ] (anatomy,zoology) any of various air-filled cavities especially in the bones of the skull
Related terms: cavity frontal_sinus paranasal_sinus maxillary_sinus ethmoid_sinus ethmoidal_sinus
2. [ noun ] (anatomy,zoology) an abnormal passage leading from a suppurating cavity to the body surface
Synonyms: fistula
Related terms: passage
3. [ noun ] (anatomy,zoology) a wide channel containing blood; does not have the coating of an ordinary blood vessel
Synonyms: venous_sinus
Related terms: duct sigmoid_sinus coronary_sinus straight_sinus transverse_sinus cavernous_sinus
Similar spelling:   sinuous
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