'Siskiwit' definitions:
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Siskiwit \Sis"ki*wit\, n. (Zool.)
The siscowet.
[1913 Webster]
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Siscowet \Sis"co*wet\, n. [OF American Indian origin.] (Zool.)
A large, fat variety of the namaycush found in Lake Superior;
-- called also siskawet, siskiwit.
[1913 Webster]