Definition of carbon dioxide (co2)

1) a compound consisting of one carbon and two oxygens. It is a reactant in photosynthesis and necessary for plant life. Abundant in the atmosphere due to anthropogenic and natural activities. It is a greenhouse gas.

source: [Journal of Geophysical Research;v96; 7301-7312;1991] [Environmental Science and Technology;v28; 1565-1576;1994]