muzzle

n. 1 projecting part of an animal's face, including the nose and mouth. 2 guard, usu. Of straps or wire, put over an animal's nose and mouth to stop it biting or feeding. 3 open end of a firearm. v. (-ling) 1 put a muzzle on. 2 impose silence on. [medieval latin musum]

v. i. The projecting mouth and nose of a quadruped, as of a horse; a snout.