ni'trogen diox'ide

a reddish-brown, highly poisonous gas, NO2, used as an intermediate in the manufacture of nitric and sulfuric acids, and as a nitrating and oxidizing agent; a major air pollutant from the exhaust of internal combustion engines that are not fitted with pollution control devices.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

nitrogen cyclenitrogen fixation
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