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flagfish

[flag-fish]
noun, plural (especially collectively) flag·fish, (especially referring to two or more kinds or species) flag·fish·es.
  1. Also called American flagfish. a killifish, Jordanella floridae, inhabiting swamps and streams of Florida, having a blue-brown back and whitish sides with red stripes, often kept in aquariums.
  2. any of several other brightly colored fishes.
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Origin of flagfish

flag1 + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018