mufflerPronunciation: /ˈmʌflə/Translate muffler | into French | into German | into Italian | into Spanish Definition of muffler noun 1a wrap or scarf worn around the neck and face for warmth. 2a device used to deaden the sound of a drum, bell, piano, or other instrument. North American a silencer for a motor vehicle exhaust. muffler in other Oxford dictionaries Definition of muffler in the US English dictionary