1. (noun)damper a movable iron plate that regulates the draft in a stove or chimney or furnace Synonyms: muffler
2. (noun)damper, muffler a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations Synonyms: damper, silencer, muffler
3. (noun)damper a depressing restraint Synonyms: muffler