noun (guppi, es)
- A tiny freshwater fish, Poecilia reticulata, popular in home aquariums, that usually has a plain body and black or dark blue tail for the females and a more colorful tail for the males.
- Fred kept a tank of guppies by the windowsill.
- By extension, any tiny fish.
- Throw that one back; it"s just a guppy!
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