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splittail

[split-teyl]
noun
  1. a minnow, Pogonichthys macrolepidotus, of the Sacramento River, having the upper lobe of the tail much longer than the lower lobe: habitat changes have greatly reduced its numbers.
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Origin of splittail

An Americanism dating back to 1880–85; split + tail1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018