Origin of conchoidfrom Classical Greek konchoeid?s(gramm?), conchoid (line), literally , mussel-like: see conch and -oid
- (mathematics) Any of a family of curves defined as the locus of a point, P, on a line from a given fixed point to a given curve, C, where the distance along the line from C to P remains constant.
- The conchoid of a circle with respect to a point on the circle is a cardioid if the fixed distance is equal to the diameter of the circle.
- The Conchoid of Nicomedes is the conchoid of a straight line with respect to a point not on the line.