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exhaust-gas recirculation

[ig-zawst-gas]
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noun Automotive.
  1. a method of returning part of the exhaust gases to an engine by means of a valve (EGR valve) in order to reduce the combustion temperature, which leads to a reduction in the formation of pollutants. Abbreviation: EGR
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018