n. [ Gr. &unr_; like ivy; &unr_; 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 ]
n. (Zool.) The Lake herring (Coregonus Artedi), valuable food fish of the Great Lakes of North America. The name is also applied to Coregonus Hoyi, a related species of Lake Michigan. [ 1913 Webster ]