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Definition of cissoid

The word cissoid uses 7 letters:cdiioss.

CISSOID is playable in:

Words With Friends11
Scrabble US10
Scrabble UK10

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. 2