noun, plural quill·backs, (especially collectively) quill·back.
a carpsucker, Carpiodes cyprinus, inhabiting waters in the central and eastern U.S., having one ray of the dorsal fin greatly elongated.
Origin of quillback
Also called quillback carpsucker.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019