CO2

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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, carbonic acid gas
• Derivationally related forms:
carbonate (for: carbon dioxide)
• Hypernyms:
dioxide, greenhouse gas, greenhouse emission
• Hyponyms:
chokedamp, blackdamp