In geometry, a nephroid (from the Greek ὁ νεφρός ho nephros) is a specific plane curve whose name means 'kidney-shaped' (compare nephrology). Although the term nephroid was used to describe other curves, it was applied to the curve in this article by Proctor in 1878. A nephroid is an algebraic curve of degree 6. It can be generated by rolling a circle with radius on the outside of a fixed circle with radius . Hence, a nephroid is an epicycloid.

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• In geometry, a nephroid (from the Greek ὁ νεφρός ho nephros) is a specific plane curve whose name means 'kidney-shaped' (compare nephrology). Although the term nephroid was used to describe other curves, it was applied to the curve in this article by Proctor in 1878. A nephroid is an algebraic curve of degree 6. It can be generated by rolling a circle with radius on the outside of a fixed circle with radius . Hence, a nephroid is an epicycloid. (en)
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• In geometry, a nephroid (from the Greek ὁ νεφρός ho nephros) is a specific plane curve whose name means 'kidney-shaped' (compare nephrology). Although the term nephroid was used to describe other curves, it was applied to the curve in this article by Proctor in 1878. A nephroid is an algebraic curve of degree 6. It can be generated by rolling a circle with radius on the outside of a fixed circle with radius . Hence, a nephroid is an epicycloid. (en)
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• Nephroid (en)
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