sinuses

'sinuses'

[fistula.n.02] as in: an abnormal passage leading from a suppurating cavity to the body surface

'sinuses'

[sinus.n.02] as in: any of various air-filled cavities especially in the bones of the skull

'sinuses'

[venous_sinus.n.01] as in: a wide channel containing blood; does not have the coating of an ordinary blood vessel