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1. (n.) carbon cycle
the biological cycle by which atmospheric carbon dioxide is converted to carbohydrates by plants and other photosynthesizers, consumed and metabolized by organisms, and returned to the atmosphere through respiration, decomposition, and the combustion of fossil fuels.
2. carbon cycle
a cycle of nuclear transformations in stellar interiors through which hydrogen is converted into helium.
Etymology: (1910–15)
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| Definition of 'carbon cycle' |
Princeton's WordNet |
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1. (noun) carbon cycle
the organic circulation of carbon from the atmosphere into organisms and back again
2. (noun) carbon cycle
a thermonuclear reaction in the interior of stars
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Definitions of carbon cycle 
