different between cissoidal vs cissoid

English

cissoid +? -al

cissoidal (not comparable)

From Ancient Greek ?????? (kissós, “ivy”) + ????? (eîdos, “form, image”).

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

Send