from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A device used in film production, having hinged boards that are brought together with a clap, used to synchronize picture and sound at the start of each take of a motion picture or other video production.
from the GNU version of the Collaborative International Dictionary of English
- n. a device which synchronizes sound and picture while making a motion picture, consisting of boards held in front of a movie camera, which are are banged together.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. photographic equipment used to synchronize sound and motion picture; boards held in front of a movie camera are banged together
clapper + board (Wiktionary)