Etymology
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carbon monoxide (n.)

1869, so called because it consists of one carbon and one oxygen atom (as opposed to carbon dioxide, which has two of the latter). An older name for it was carbonic oxide gas.

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Definitions of carbon monoxide

carbon monoxide (n.)
an odorless very poisonous gas that is a product of incomplete combustion of carbon;
Synonyms: carbon monoxide gas / co
From wordnet.princeton.edu