[mathematics] A conchoid is a curve derived from a fixed point O, another curve, and a length d. For every line through O that intersects the given curve at A the two points on the line which are d from A are on the conchoid. The conchoid is, therefore, the cissoid of a circle with center O and the given curve. They are called conchoids bec...
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http://en.wikipedia.org/wiki/Conchoid_(mathematics)
• (n.) A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.
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http://thinkexist.com/dictionary/meaning/conchoid/
The conchoid of Nicomedes – the three cases: a = b (blue curve); a > b (white curve); a < b (red curve) A shell-shaped curve. Given a point A and a curve C, if we pick a point Q on C and draw a line L through A and Q and mark points P and P' on L at some fixed distance in either direction ...
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http://www.daviddarling.info/encyclopedia/C/conchoid.html
Con'choid noun [ Greek ...; ... shell + ... form: confer French
conchoïde .]
(Geom.) A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.
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http://www.encyclo.co.uk/webster/C/127
In geometry, a conchoid is a curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.
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http://www.probertencyclopaedia.com/browse/AC1.HTM
conchoid 1. Like a shell or shell-like. 2. A simple curve.
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http://www.wordinfo.info/words/index/info/view_unit/532/2
a plane curve such that if a straight line is drawn from a certain fixed point, called the pole of the curve, to the curve, the part of the line intersected between the curve and its asymptote is always equal to a fixed distance. Equation:= b ± a sec &thgr;. r
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https://www.infoplease.com/dictionary/conchoid
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