noun, plural guppies.
a small, freshwater topminnow, Poecilia reticulata, often kept in aquariums.
Also called rainbow fish.

named after R.J.L. Guppy (1836–1916) of Trinidad, who presented specimens to the British Museum; catalogued under the New Latin name Gerardinus guppyi in 1866 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
guppy (ˈɡʌpɪ)
n , pl -pies
a small brightly coloured freshwater viviparous cyprinodont fish, Lebistes reticulatus, of N South America and the Caribbean: a popular aquarium fish
[C20: named after R. J. L. Guppy, 19th-century clergyman of Trinidad who first presented specimens to the British Museum]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1925, named for R.J.L. Guppy, Trinidad clergyman who supplied the first specimen (1866) to the British Museum. The family name is from a place in Dorset. The class of streamlined U.S. submarines (1948) is an acronym from greater underwater propulsion power + -y.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The intervention of humans into this situation is about as needed as a guppy needing a bicycle.
In their quest for mates, some guppy males are show-offs.
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