photorespiration
noun
pho·to·res·pi·ra·tion
ˌfō-tō-ˌre-spə-ˈrā-shən
: a light-dependent process in some plants resulting in the oxidation of glycolic acid and release of carbon dioxide that under some environmental conditions (such as high temperature) tends to inhibit photosynthesis
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Merriam-Webster unabridged
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