1520s, partial translation of Middle Dutch klapholt (borrowed into English late 14c. as clapholt), from klappen "to fit" + Low German holt "wood, board" (see holt). Compare German [..]

This architectural term refers to a thin, narrow board with one edge thicker than the other and is used as siding.

 – Also known as the clapper. A small board which holds information identifying a shot. It is filmed at the beginning of a take. Also called a slate or “sticks.”

(clapper (board) or slate) a small black or white board or slate with a hinged stick on top that displays identifying information for each shot in a movie, and is filmed at the beginning of a take. Th [..]

(n) a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below(v) cover with clapboards

A long thin board, thicker on one edge, overlapped and nailed on for exterior siding.

A small black or white board with a hinged stick on top that displays identifying information for each shot in the movie. Assists with organizing shots during editing process; the clap of the stick allows easier synchronization of sound and video within each shot.

(also known as a Clapperboard)

Before each take, a clapboard appears in front of the camera, with the number of the take written on it.