Definition of carbon monoxide noun from the Oxford Advanced Learner's Dictionary

 

carbon monoxide

 noun
noun
BrE BrE//ˌkɑːbən mənˈɒksaɪd//
 
; NAmE NAmE//ˌkɑːrbən mənˈɑːksaɪd//
 
[uncountable](symbol CO)
 
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a poisonous gas formed when carbon burns partly but not completely. It is produced when petrol/gas is burnt in car engines.
See the Oxford Advanced American Dictionary entry: carbon monoxide