What does sinus mean?

n. A sinus is an air-filled space in the skull that is connected to the nasal passages. It helps with things like breathing and speaking.

sinus

🇺🇸 /ˈsaɪnəs/ 🇬🇧 /ˈsaɪnəs/

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noun

A sinus is an air-filled space in the skull that is connected to the nasal passages. It helps with things like breathing and speaking.

I have a headache because of my blocked sinuses.

A sinus is an air-filled space in the skull that is connected to the nasal passages. It helps with things like breathing and speaking.

Plural sinuses