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in automobiles, device designed to reduce the noise from the exhaust of an internal-combustion engine. When the exhaust gases from an internal-combustion engine are released directly into the atmosphere, they create a loud noise, caused by the passage of the exhaust gases from the high pressure of the cylinder to the normal pressure of the atmosphere. To eliminate or tone down the noise, the gases are led through a pipe to a muffler. Typically a muffler consists of a tubular metal jacket containing perforated pipes and chambers through which the exhaust gases flow before entering the atmosphere. The pipes and chambers are arranged so that the noise from the exhaust gases is reflected back toward the engine or back and forth among the chambers, reducing greatly the amount of noise that is radiated into the environment.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


A device to deaden the noise produced by escaping gases or vapors.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

sound attenuator

In ductwork, a device (usually prefabricated) especially designed to provide much greater sound attenuation than would be provided by an equal length of ductwork; the pressure drop through the device is greater than for an equal length of ductwork.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


US and Canadian any device designed to reduce noise, esp the tubular device containing baffle plates in the exhaust system of a motor vehicle
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
After removing the forward muffler (p/n 66894-00) from the #1 and #2 cylinders, visual inspection revealed the muffler baffling had separated, blocking the exhaust port.
An existing ordinance (CO) in Cebu City also prohibits the use of modified mufflers.
That is when we decided to check on the muffler. To our shock it was completely clogged.
In this paper, the muffler structures need to be improved and the performances of muffler improved need to be evaluate through the relevant indicators.
Ideal for shallow water and fat mud, the 37 has a stainless muffler, CDI electronic ignition and electronic fuel injection.
Most budgets in the judiciary focus on courthouses alone, Muffler said, instead of judges and court personnel.
" We wanted to use the Muffler Man tagline and impart the ideals of our party which are honesty, fighting against corruption and women safety," said Mohit Ramani, an engineer, who along with six volunteers developed the game.
And the way it was set up, I wasn't ready to buy the Muffler Shop either and try to start that on my own.
New Delhi: It may have been ridiculed by many, but the 'Muffler Man' campaign on social media by Aam Aadmi Party volunteers has the party laughing all the way to the bank as it sees a "rise" in donations ahead of Delhi assembly election.
Coverage includes propagation of waves in ducts, theory of acoustic filters, flow-acoustic analyses and measurements, dissipative ducts and parallel baffle mufflers, three-dimensional analysis, and muffler design.