nounpl. -·back· or -·backs·
a North American freshwater fish (Carpiodes cyprinus) of the sucker family, with the front margin of the dorsal fin quill-like and elongate
nounpl. quillback, or quill·backs
A North American freshwater fish (Carpiodes cyprinus) that has one ray of the dorsal fin extending conspicuously beyond the others.