cissoid

1 definition found

cissoid - Collaborative International Dictionary of English v.0.48 :

  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]