#silencer.acoustic_device__muffler  a tubular acoustic device inserted in the exhaust system that is designed to reduce noise
  supertype:  #acoustic_device  a device for amplifying or transmitting sound
  part of:  #exhaust_system__exhaustsystem__exhaust  system consisting of the parts of an engine through which burned gases or steam are discharged
     part of:  #automobile_engine  the engine that propels an automobile
        part of:  #car__auto__automobile__machine__motorcar  4-wheeled motor vehicle; usually propelled by an internal combustion engine; "he needs a car to get to work"

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