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nitre
nitric
nitric acid
nitric oxide
nitric oxide synthase
nitride
nitrify
nitrifying bacterium
nitrile
nitrile rubber
nitrite
nitrite bacterium
nitro
nitro-
nitroaniline
nitrobacterium
nitrobenzene
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nitrogen dioxide
ni·tro·gen di·ox·ide


noun 
Definition:
 
poisonous brown gas: a highly poisonous brown gas often present in smog and exhaust from vehicles. Use: manufacture of nitric and sulfuric acids. NO2
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