Definition

A hollow space or cavity in the body, often referring to air-filled spaces in the skull that connect to the nasal passages.

Example

The doctor examined my sinuses to check for any signs of infection.

Conversation

I’ve been having this terrible headache lately.

Maybe it's your sinus acting up again.

I think you're right; it feels really congested.

You should try a warm compress — it might help with your sinus pain.

Synonyms & Antonyms

Root Explanation

Sinus → It originates from Latin 'sinus' (meaning bay, fold, or curve). The word refers to a curved or hollow shape, often used in anatomical contexts to describe cavities or spaces in the body.

Memory Tip

Imagine a 'bay' or 'curve' when thinking of 'sinus' — it helps you remember that it refers to a hollow space or cavity.

Visually Confused Words