clap·board 
(klăbərd, klăpbôrd′)
(klăbərd, klăpbôrd′)n.
A long narrow board with one edge thicker than the other, overlapped horizontally to cover the outer walls of frame structures. Also called weatherboard.
tr.v. clap·board·ed, clap·board·ing, clap·boards
To cover with clapboards.
[Partial translation of Dutch klaphout : klappen, to split, crack + Middle Dutch holt, board.]
clapboard