Meaning of the word sinus in English

What does sinus mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

sinus

US /ˈsaɪ.nəs/

UK /ˈsaɪ.nəs/

a cavity within a bone or other tissue, especially in the bones of the face or skull communicating with the nostrils and containing air.

Example:

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I have a terrible headache due to my inflamed sinuses.

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The doctor said my sinus infection is clearing up.

Synonym:

cavity hollow recess

a curve or a curving line.

Example:

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The wave form showed a perfect sinus curve.

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In mathematics, the sinus function is fundamental to trigonometry.