Cis·co 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.
  ◄ ►
  Coregonus artedi
       n : important food fish of cold deep lakes of North America
           [syn: cisco, lake herring]