Definition of conchoid
Noun 1. Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts). 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. 2. A conchoidal fracture in rock.
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English  German  conchoid
Muschellinie, Schneckenlinie, Konchoide, Muschelkurve
English  Italian  conchoid
s. concoide, curva algebrica del quarto grado usata per risolvere i problemi della trisezione dell'angolo e della duplicazione del cubo (matem.)

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