Bible Dictionaries
Cissoid

Webster's Dictionary

(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.

Bibliography Information
Webster, Noah. Entry for 'Cissoid'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​c/cissoid.html. 1828.