carbon dioxide

noun
Updated on: 8 Nov 2017

Definition of carbon dioxide

:a heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages

Recent Examples of carbon dioxide from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'carbon dioxide.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of carbon dioxide

1867


CARBON DIOXIDE Defined for English Language Learners

carbon dioxide

noun

Definition of carbon dioxide for English Language Learners

  • : a gas that is produced when people and animals breathe out or when certain fuels are burned and that is used by plants for energy


CARBON DIOXIDE Defined for Kids

carbon dioxide

noun carbon di·ox·ide \ -dī-ˈäk-ˌsīd \

Definition of carbon dioxide for Students

:a heavy colorless gas that is formed by burning fuels, by the breakdown or burning of animal and plant matter, and by the act of breathing and that is absorbed from the air by plants in photosynthesis

Medical Dictionary

carbon dioxide

noun

medical Definition of carbon dioxide

:a heavy colorless gas CO2 that does not support combustion, dissolves in water to form carbonic acid, is formed especially in animal respiration and in the decay or combustion of animal and vegetable matter, is absorbed from the air by plants in photosynthesis, and is used in the carbonation of beverages

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