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  1. Oxford American Dictionary

    carbon dioxide

    • IPA[ˌkärbən dīˈäkˌsīd]

    美式

    • n.
      a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

    • noun: carbon dioxide