guppy

UK: /ˈgʌpi/ US: /ˈgʌpi/ ,(gup′ē)

Inflections of 'guppy' (n): npl: guppies

WordReference Random House Learner's Dictionary of American English © 2026

gup•py /ˈgʌpi/   n. [countable] , pl. -pies. 

1. Fish a small freshwater fish of the Caribbean often kept in aquariums.

WordReference Random House Unabridged Dictionary of American English © 2026

gup•py  (gup′ē), n., pl. -pies. 

1. Fish a small, freshwater topminnow, Poecilia reticulata, often kept in aquariums. Also called rainbow fish. 

• catalogued under the Neo-Latin name Gerardinus guppyi in 1866 named after R.J.Latin. Guppy (1836–1916) of Trinidad, who presented specimens to the British Museum

Collins Concise English Dictionary © HarperCollins Publishers::

guppy / ˈɡʌpɪ/ noun ( -pies)

1. a small brightly coloured freshwater viviparous cyprinodont fish, Lebistes reticulatus, of N South America and the Caribbean: a popular aquarium fish

Etymology: 20th Century: named after R. J. L. Guppy, 19th-century clergyman of Trinidad who first presented specimens to the British Museum