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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.


A device to deaden the noise produced by escaping gases or vapors.

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.


US and Canadian any device designed to reduce noise, esp the tubular device containing baffle plates in the exhaust system of a motor vehicle
References in classic literature ?
repeated Toby, using his right-hand muffler like an infantine boxing-glove, and punishing his chest for being cold.
Richard twisted a muffler twice round his throat and struggled up on deck.
Dark, slim chap he was," the patient continued, "a regular howling swell,--silk hat, white muffler, white kid gloves,--all the rest of it.
Good night, dear; take care of yourself, and keep your muffler round your mouth going over the bridge, or you 'll be as hoarse as a crow to-morrow," said Polly, as she kissed her brother, who returned it without looking as if he thought it "girl's nonsense" Then the three piled into the sleigh and drove off, leave Polly nodding on the doorstep.
It was rather a silent drive, for Will obediently kept his muffler up, and Tom fell into a brown study.
But when a long old man in a blanket overcoat, his head tied up in a handkerchief and nearly his entire face in a muffler, wearing green goggles and with a complexion of glittering whiteness where it could be seen, strode silently into the room, laying a hard, gloved hand on Mr.
Love can see through five folds of closely-woven muffler with ease!
Fat man with a woollen muffler and a quill toothpick.
If you see John--Captain Beard--without his muffler at night, just remind him from me to keep his throat well wrapped up.
Tenders are invited for Furnish All Labor, Materials, And Equipment To Replace Mufflers On Generators At The East Bank Water Treatment Plant For The Jefferson Parish Department Of Water
With the rising public awareness and concern for noise control properly designed mufflers for compressors are now becoming more and more important.
Established 19 yrs this family owned Muffler Shop, includes all the equipment necessary to service any & all types of Mufflers.