MASSETER • DICCIONARIO INGLES.COM • Definition of Masseter

... there is a pulsating depressing or sinking of the head and neck. In some cases, the muscles of the neck are the principal seat of the disease, or some muscle of the face; the temporal muscle beating like an artery; the masseter opening and closing the mouth, the muscles of the eyelid, and, in a few cases, those of the eye itself being affected. These convulsive movements generally, yet not uniformly, cease during sleep, but that sleep ...

— The Dog - A nineteenth-century dog-lovers' manual, - a combination of the essential and the esoteric. • William Youatt