Definitions
from The Century Dictionary.
- Kidney-shaped; reniform; in botany, resembling the genus Nephrodium.
- noun In mathematics, a curve of the sixth order with one triple and one single crunode, the polar equation being r = a (1 + 2 sin ½θ).
Etymologies
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Examples
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To the right you see an ordinary nephroid lurking in a coffee cup.
Rambles at starchamber.com » Blog Archive » Imaginary Law Firms, Part 1: Brannock, Foley, and Freeth 2008
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You know the ordinary nephroid as the reflected catacaustic of a circle, the involute of Caley’s sextic, and a generally good-natured two-cusped epicycloid.
Rambles at starchamber.com » Blog Archive » Imaginary Law Firms, Part 1: Brannock, Foley, and Freeth 2008
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But Freeth’s nephroid is something altogether different: a strophoid of a circle with a double curlicue in the kidney crotch.
Rambles at starchamber.com » Blog Archive » Imaginary Law Firms, Part 1: Brannock, Foley, and Freeth 2008
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T.J. Freeth 1819-1904, our firm’s founder, was unavailable when the photographer came around, but this is his nephroid.
Rambles at starchamber.com » Blog Archive » Imaginary Law Firms, Part 1: Brannock, Foley, and Freeth 2008
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