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carbon dioxide (n.)

1869, so called because it consists of one carbon and two oxygen atoms. The chemical was known since mid-18c. under the name fixed air; later as carbonic acid gas (1791). "The term dioxide for an oxide containing two atoms of oxygen came into use in the middle of the 19th century." [Flood].

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Definitions of carbon dioxide from WordNet

carbon dioxide (n.)
a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis;
Synonyms: CO" / carbonic acid gas
From wordnet.princeton.edu