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Definition of carbon monoxide noun from the Oxford Advanced American Dictionary

 

carbon monoxide

 noun
noun
NAmE//ˌkɑrbən məˈnɑksaɪd//
 
[uncountable] (symbol CO)
 
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a poisonous gas formed when carbon burns partly but not completely. It is produced when gas is burned in car engines.
See the Oxford Advanced Learner's Dictionary entry: carbon monoxide