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rainbow darter

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noun
  1. a stout darter, Etheostoma caeruleum, inhabiting the Great Lakes and Mississippi River drainages, the spawning male of which has the sides marked with oblique blue bars with red interspaces.
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Origin of rainbow darter

An Americanism dating back to 1880–85
Also called soldierfish.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018