1 [klab-erd, klap-bawrd, ‐bohrd]
Chiefly Northeastern U.S. a long, thin board, thicker along one edge than the other, used in covering the outer walls of buildings, being laid horizontally, the thick edge of each board overlapping the thin edge of the board below it. See illus. under siding.
British. a size of oak board used for making barrel staves and for wainscoting.
of or made of clapboard: a clapboard house.

1510–20; earlier clap bord, alteration of obsolete clapholt < Low German klappholt (cognate with Dutch klaphout) split wood used for barrel staves; see clap1, holt Unabridged


2 [klap-bawrd, -bohrd]
noun Movies.
a small board with a hinged stick attached that is clapped down at the beginning of the filming of a shot for use later in synchronizing sound and image in the editing of the film.
Also called clapper board, clapstick [klap-stik] .

clap1 + board Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clapboard (ˈklæpˌbɔːd, ˈklæbəd)
1.  a.  a long thin timber board with one edge thicker than the other, used esp in the US and Canada in wood-frame construction by lapping each board over the one below
 b.  (as modifier): a clapboard house
2.  (tr) to cover with such boards
[C16: partial translation of Low German klappholt, from klappen to crack + holt wood; related to Dutch claphout; see board]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1520, partial transl. of M.Du. klapholt (borrowed into Eng. 14c.), from klappen "to fit" + L.Ger. holt "wood, board."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The first settlement was a jumble of canvas tents, clapboard shops and saloons clustered near a muddy creek.
Then, hundreds of roosters that scratch between clapboard houses on both sides of the river start clearing their throats.
Each family unit has two clapboard huts that sit on stilts to lift them clear of rising water.
Below me are pastures and cornfields anchored by red barns and white clapboard
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