Definition of cisco in US English:

cisco

nounPlural ciscoes

  • A freshwater whitefish of northern countries. Most species are migratory and are important food fishes.

    Genus Coregonus, family Salmonidae: several species, including the lake cisco (C. artedii) of North America, and the Arctic cisco (C. autumnalis) of northern Eurasia and northern North America

    • ‘Only a handful of endangered species, such as the Tecopa pupfish, the longjaw cisco, and the dusky seaside sparrow, have ever been taken off the list because they went extinct.’
    • ‘Other Great Lakes species that have been lost are the deepwater cisco in the 1950's, the blackfin cisco in the 1960s, and the longjaw cisco in the 1970's.’
    • ‘Overfishing of other species of ciscoes has reduced populations, and shifted more pressure to Coregonus hoyi.’
    • ‘They prey on such fish as the cisco (lake herring), lake whitefish, central mudminnow, and golden shiner.’
    • ‘Coregonine fishes in New York, both whitefish and cisco, have been extensively introduced into waters outside of their natural ranges, such as lakes in the Adirondack Mountains.’

Origin

Mid 19th century: of unknown origin.

Pronunciation

cisco

/ˈsiskō/