cissoid
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English
Etymology
From Ancient Greek κισσός (kissós, “ivy”) + εἶδος (eîdos, “form, image”).
Noun
cissoid (plural cissoids)
- (geometry) Any of a family of curves defined as the locus of a point, P, on a line from a given fixed point and intersecting two given curves, C1 and C2, where the distance along the line from C1 to P remains constant and equal to the distance from P to C2.
- The cissoid of a circle and a line is a conchoid