catalytic converter

noun
an antipollution device in an automotive exhaust system that contains a catalyst for chemically converting some pollutants in the exhaust gases, as carbon monoxide, unburned hydrocarbons, and oxides of nitrogen, into harmless compounds.

Origin:
1960–65

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
catalytic converter
 
n
Sometimes shortened to: catcon a device using three-way catalysts to reduce the obnoxious and poisonous components of the products of combustion (mainly oxides of nitrogen, carbon monoxide, and unburnt hydrocarbons) from the exhausts of motor vehicles

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Catalytic_converter is always a great word to know.
So is interrobang. Does it mean:
a gadget; dingus; thingumbob.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
Restoring a tampered catalytic converter system can be an expensive job.
The addition of low sulphur fuel and upcoming catalytic converter technology
  make diesel the way to go.
The modern fuel injection system works with a three-way catalytic converter to
  cut pollution.
The vehicle will fail if the catalytic converter is missing or damaged.
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