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pho·to·pho·re·sis | \ ˌfōtəfəˈrēsə̇s \
plural photophoreses\ -ēˌsēz \
Definition of photophoresis
: movement of small particles (as dust particles) under the influence of radiant energy (as light) that is considered positive when the movement is away from the source of energy and negative when toward it — compare magnetophotophoresis
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