Definitions for co2
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Princeton's WordNet
carbon dioxide, CO2, carbonic acid gas(noun)
a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
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"co2." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/co2>.