Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun sinus

3 senses of sinus

Sense 1
fistula, sinus -- (an abnormal passage leading from a suppurating cavity to the body surface)
       => passage, passageway -- (a path or channel or duct through or along which something may pass; "the nasal passages")

Sense 2
sinus -- (any of various air-filled cavities especially in the bones of the skull)
       => cavity, bodily cavity, cavum -- ((anatomy) a natural hollow or sinus within the body)

Sense 3
venous sinus, sinus -- (a wide channel containing blood; does not have the coating of an ordinary blood vessel)
       => duct, epithelial duct, canal, channel -- (a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance; "the tear duct was obstructed"; "the alimentary canal"; "poison is released through a channel in the snake's fangs")