sinus
A sinus is a hollow space or cavity within your head.
The word "sinus" can sound scary when it's used medically, but basically it refers to air-filled spaces in your skull. You have sinuses above and below your eyes, which help you breathe more easily by warming, humidifying, and filtering the air we inhale. If you get a sinus infection or have allergies that irritate your sinuses, you might feel pain or pressure in these areas. Doctors will often check for issues with sinuses when diagnosing headaches or other problems related to the head and face.
How common is "sinus"?
Word sinus is considered uncommon in modern English.
It appears most frequently in academic texts and less often in other writings.
It appears most frequently in academic texts and less often in other writings.
Definitions
noun
(anatomy, zootomy) A pouch or cavity in a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities (the paranasal sinus).
Real examples of "sinus" in context
