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Definition of CLAPBOARD
archaic: a size of board for making staves and wainscoting
: a narrow board usually thicker at one edge than the other used for siding
\ˈklap-ˌbȯrd\: a pair of hinged boards one of which has a slate with data identifying a piece of film and which are banged together in front of a motion-picture camera at the start of a take to facilitate editing —called also clapper board
Narrow board tapered toward one edge, used as siding to cover the exterior of a framed building. Clapboards are attached horizontally, each overlapping the next one down. Cleft oak clapboard was introduced to New England in the 17th century; later materials included pine, cypress, and cedar.