cissoid

Etymology
From +.

Noun

 * 1)  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

Translations

 * Czech:
 * French:
 * German: Zissoide
 * Polish: cisoida