of or relating to photography employing a device that synchronizes the photoflash with the shutter.
Origin of synchroflash
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a mechanism in a camera that enables the shutter to be fully open while the light from a flashbulb or electronic flash is at its brightest
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