Meaning of exhaust-gas recirculation

ex•haust'-gas recircula"tion

Pronunciation: (ig-zôst'gas"), [key]
— Auto. Auto.
  1. a method of returning part of the exhaust gases to an engine by means of a valvein order to reduce the combustion temperature, which leads to a reduction in the formation of pollutants. Abbr.: EGR
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.