[sis-koh] 
) -co, (especially referring to two or more kinds or species) -coes, -cos. | any of several whitefishes of the genus Coregonus, of the Great Lakes and smaller lakes of eastern North America. |
| cis·co (sĭs'kō) n. pl. cis·coes or cis·cos Any of several North American freshwater fishes of the genus Coregonus or Leucichthys, related to and resembling the whitefish. [From Canadian French ciscoette, from Ojibwa bemidewiskawed, the (fish) with oily skin.] |