From The Collaborative International Dictionary of English v.0.48:

guppy \guppy\ n. [Named after R. J. L. Guppy, who brought
   speciments to the British museum. --RHUD]
   A small freshwater fish of South America and West Indies
   (Lebistes reticulatus or Poecilia reticulata, originaly
   called Gerardinus guppyi), often kept in aquariums; also
   called rainbow fish.

   Syn: rainbow fish, Lebistes reticulatus.
        [WordNet 1.5]
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