Cissoid

Cis"soid

(?), n. [Gr. like ivy; ivy + e'i^dos form.] (Geom.) 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.
[1913 Webster]

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Fri 15th January 2021