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Definition of Cissoid
1. n. A curve invented by Diocles, for the purpose of solving two celebrated problems of the higher geometry; viz., to trisect a plane angle, and to construct two geometrical means between two given straight lines.
Definition of Cissoid
1. Noun. (geometry) A kind of curve that can be used in trisecting a plane angle and in constructing two geometrical means between two given straight lines. ¹
¹ Source: wiktionary.com
Definition of Cissoid
1. a type of geometric curve [n -S]