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quillback

[kwil-bak]
noun, plural quill·backs, (especially collectively) quill·back.
  1. a carpsucker, Carpiodes cyprinus, inhabiting waters in the central and eastern U.S., having one ray of the dorsal fin greatly elongated.
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Origin of quillback

An Americanism dating back to 1880–85; quill + back1
Also called quillback carpsucker.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018