photography using a momentary flash of artificial light as a source of illumination.
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British Dictionary definitions for flash photography
photography in which a flashbulb or electronic flash is used to provide momentary illumination of a dark or insufficiently lit subject
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012