Definition of photosynthesis
: synthesis of chemical compounds with the aid of radiant energy and especially light
especially
: formation of carbohydrates from carbon dioxide and a source of hydrogen (such as water) in the chlorophyll-containing cells (as of green plants) exposed to light
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Merriam-Webster unabridged
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Time Traveler for photosynthesis
The first known use of photosynthesis was in 1898
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