High Quality Content by WIKIPEDIA articles! 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. He called them conchoids because the shape of their outer branches resemble conch shells.The often-so-called conchoid of de Sluze and conchoid of Durer do not fit this definition; the former is a strict cissoid and the latter a construction more general yet.

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