Clapboard (/ˈklæbərd/), also called bevel siding, lap siding, and weatherboard, with regional variation in the definition of those terms, is wooden siding of a building in the form of horizontal boards, often overlapping.
Clapboard, in modern American usage, is a word for long, thin boards used to cover walls and (formerly) roofs of buildings.[1] Historically, it has also been called clawboard and cloboard.[2] In the United Kingdom, Australia and New Zealand, the term weatherboard is always used.[3][4]
An older meaning of "clapboard" is small split pieces of oak imported from Germany for use as barrel staves, and the name is a partial translation (from klappen, "to fit") of Middle Dutch klapholt and related to German Klappholz.[1]