"ˌ noun
Etymology: phot- + respiration
: a light-dependent process in some higher plants that involves the uptake of molecular oxygen, the synthesis of glycolic acid in chloroplasts, and the subsequent oxidation of glycolic acid in peroxisomes followed by the release of carbon dioxide from mitochondria and that tends to inhibit photosynthesis especially at higher temperatures, oxygen levels, and light intensities due to competition for a common metabolic substrate
• pho·to·respiratory "ˌ adjective
• pho·to·respire "ˌ intransitive verb