Sinus

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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At a glance

Class

Notion

Domain

Science and technology

In collections

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What Wikipedia says

A sinus is a sac or cavity in any organ or tissue, or an abnormal cavity or passage. In common usage, "sinus" usually refers to the paranasal sinuses, which are air cavities in the cranial bones, especially those near the nose and connecting to it.

Excerpt from the Wikipedia article “Sinus (anatomy)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Doç.Dr.Tosun Tosun, CC BY-SA 3.0, via Wikimedia Commons.