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The Collaborative International Dictionary
Siscowet

Siscowet \Sis"co*wet\, n. [OF American Indian origin.] (Zo["o]l.) A large, fat variety of the namaycush found in Lake Superior; -- called also siskawet, siskiwit.

Wiktionary
siscowet

n. A freshwater fish from Lake Superior in the Great Lakes, a variety of the lake trout.