Muffler. A term derived from the French word amusler, to cover. The muslau or muffle is a word of French derivation which has been in use for centuries to describe a cover for the mouth, nose, and even the whole face; hence our word muzzle. Muffler, in early times, was the name of a sort of veil worn by females. The French at present call their winter gloves moufles, and single pieces of stuffed fur with which a woman covers her hands, a muff. In the United States a muffler is a neckerchief, wrapper, or scarf, made of cotton, wool or silk, and worn around the throat for the procurement of warmth.