a North American grouse, Bonasa umbellus, having a tuft of black feathers on each side of the neck.
Origin of ruffed grouse
An Americanism dating back to 1745–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for ruffed grouse
a large North American grouse, Bonasa umbellus, having brown plumage with darker markings around the neck and a black-tipped fan-shaped tail
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012