fill light

noun Photography.

a light used to eliminate or soften shadows caused by the main source of illumination.

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British Dictionary definitions for fill light

fill light

noun

photog a light that supplements the key light without changing its character, used esp to lighten shadows

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