sinus
/ˈsaɪnəs/
noun
- One of the hollow spaces in the bones of the face and head that connect to the nose.
- She felt pressure in her sinuses when the plane started to descend.
- A cold can cause your sinuses to become blocked and painful.
- The doctor said my sinus infection would clear up in a week.
- A cavity or passage in the body, especially one that allows fluid to drain.
- Certain fish have a sinus that helps them sense water pressure.
- The sinus in the bone allows blood vessels to pass through.
- The surgeon cleaned the sinus to prevent further infection.