## cissoid

cis·soidMath. a curve converging into a pointed tip

Origin of cissoid

Classical Greek*kissoeid?s,*ivylike ; from

*kissos,*ivy +

*eidos,*-oid

designating the angle formed by the concave sides of two intersecting curves

## cissoid

Noun

(*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,*C*_{1}and*C*_{2}, where the distance along the line from*C*_{1}to*P*remains constant and equal to the distance from*P*to*C*_{2}.*The cissoid of a circle and a line is a conchoid*

Origin

Ancient Greek, meaning "ivy-like".