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Meaning of pupfish

pup•fish

Pronunciation: (pup'fish"), [key]
— pl. -fish, -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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.