## conchoid

con·choid a curve traced by an end point of a segment of constant length located on a straight line that rotates about a fixed point, while the other end point moves along a straight line that does not go through the fixed point

Origin of conchoid

from Classical Greek*konchoeid?s*

*(gramm?)*, conchoid (line), literally , mussel-like: see conch and -oid

## conchoid

Noun

(*plural* conchoids)

- (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.*