flashgun
noun
flash·gun ˈflash-ˌgən 
: a device for producing a bright flash of light for photography
Example Sentences
Recent Examples on the Web A kit including the K-m, an 18-55mm DA-L lens and a separate flashgun will cost $700. 
Charlie Sorrel, WIRED, 22 Sep. 2008
Charlie Sorrel, WIRED, 22 Sep. 2008 Word History
First Known Use
1925, in the meaning defined above