| carbonic acid gas 
 
 a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances;
 absorbed from the air by plants in photosynthesis
 • Syn:
 carbon dioxide, CO2
 • Derivationally related forms:
 carbonate (for: carbon dioxide)
 • Hypernyms:
 dioxide, greenhouse gas, greenhouse emission
 • Hyponyms:
 chokedamp, blackdamp
 
 
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