Sinus
01
an air-filled cavity, especially within the bones of the skull
例子
Sinus infections often cause pressure and headaches.
02
a wide blood channel that lacks the lining of a typical blood vessel
例子
Sinuses in the liver help regulate blood flow.
03
an abnormal channel that drains a pus-filled cavity to the body surface
例子
Chronic infection led to a sinus forming under the skin.
