noun, plural gup·pies.
- a small, freshwater topminnow, Poecilia reticulata, often kept in aquariums.
noun plural -pies
- a small brightly coloured freshwater viviparous cyprinodont fish, Lebistes reticulatus, of N South America and the Caribbean: a popular aquarium fish
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.