carbon dioxide /kbn daksad/ noun [uncount] BIOLOGY and CHEMISTRY

the gas that is produced when humans and other animals breathe out and when fossil fuels are burned. It is used by plants in the process of photosynthesis. Carbon dioxide is a greenhouse gas. Chemical formula: CO2

© Macmillan Publishers Limited 2004
Based on the Macmillan School Dictionary
© Bloomsbury Publishing Plc 2004