[1] : 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
see also:
lebistes reticulatus poecilia reticulata gerardinus guppyi rainbow fish 

[2] : WordNet (r) 2.0

rainbow fish
     n : small freshwater fish of south america and the west indies;
         often kept in aquariums syn: guppy, lebistes
         reticulatus
see also:
guppy lebistes reticulatus 

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