Beau's lines

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

Beau's lines are deep grooved lines that run from side to side on the fingernail or the toenail. They may look like indentations or ridges in the nail plate.

Excerpt from the Wikipedia article “Beau's lines”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Elipongo, Public domain, via Wikimedia Commons.