Nephroid

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

In geometry, a nephroid (from Ancient Greek νεφρός (nephrós) 'kidney') is a specific plane curve. It is a type of epicycloid in which the smaller circle's radius differs from the larger one by a factor of one-half.

Excerpt from the Wikipedia article “Nephroid”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sam Derbyshire at English Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.