- [Zoöl] A large cervine mammal (Alces alces syn. Alces machlis, syn Alces Americanus), native of the Northern United States and Canada. The adult male is about as large as a horse, and has very large, palmate antlers. It closely resembles the European elk, and by many zoölogists is considered the same species. See Elk.
- A member of the Progressive Party; a Bull Moose.(Obsolescent. Cant, from the early 1900's)
- (capitalized)A member of the fraternal organization named Loyal Order of Moose.
Etymology: A native name; Knisteneaux mouswah; Algonquin monse. Mackenzie