from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small cube that contains four flashbulbs and that rotates automatically to the next unused bulb when a picture is taken with the camera to which it is attached.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A rotating cube containing a flashbulb in each of four sides
From flash + cube. (Wiktionary)