1North American Any of various North American suckers (freshwater fishes of the family Catostomidae), of the genus Moxostoma or related genera, having the lower fins (and often the dorsal fin and tail) bright red or orange. Frequently with distinguishing word.
2North American, US dialect, rare The red drum, Sciaenops ocellatus.
3North American Military
slang Corned beef.
Late 18th century; earliest use found in Benjamin Hawkins (1754–1818). From red + horse.