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pupfish

[puhp-fish]
noun, plural (especially collectively) pup·fish, (especially referring to two or more kinds or species) pup·fish·es.
  1. any of several tiny, stout killifishes of the genus Cyprinodon, inhabiting marshy waters in arid areas of western North America: several species are endangered.
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Origin of pupfish

First recorded in 1945–50; pup + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018