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Definition of Photobleach
1. Verb. (intransitive) To become less absorbent, reflective or fluorescent upon exposure to light. ¹
¹ Source: wiktionary.com
Medical Definition of Photobleach
1. To lose colour or make white by the action of light; e.g., the use of a laser to bleach a fluorescent dye covalently linked to a macromolecule. (05 Mar 2000)