n.a lamp for providing momentary light to take a photograph
同义词：flashphotoflashflash lampflashbulbflash bulb
英汉双解大词典
flashgun/ˈflæʃgʌn/(flashguns)
1.
N-COUNT（可数名词）
A flashgun is a device that you can attach to, or that is part of, a camera. It makes bright flashes of light so that you can take photographs indoors. (摄影)闪光枪