sinus

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

fistula venous sinus

Sind sine sing sink

Sinai sinew singe

sinus cavernosus sinus coronarius sinus ethmoidales sinus headache sinusitis sinusoid sinusoidal sinusoidally sinusoidal projection sinus paranasales sinus rectus sinus sigmoideus sinus transversus sinus venosus sclerae