Dictionary![]() ![]() pho•to•ca•tal•y•sisPronunciation: (fō"tō-ku-tal'i-sis), [key] —n., —pl. -sesPronunciation: (-sēz"). [key] Chem. the acceleration or retardation of the reaction rate in chemical reactions by light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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