clapboard

noun

1. (countable, uncountable)A narrow board, usually thicker at one edge than the other, used as siding for houses and similar structures of frame construction.

   “Its exterior is covered with clapboards stained dark brown.”

2. (uncountable)Such boards, arranged horizontally and overlapping with thick edge down, collectively, as siding.

   “As the train wound along the river valleys through western Pennsylvania the scenery grew more rugged and the painted houses of Lancaster County gave way to dirty clapboard dwellings and shack homes clinging to the mountainside.”

3. (UK, archaic, countable, uncountable)An oak board of a size used for barrel staves.
4. A clapperboard; a device used in film production, having hinged boards that are brought together with a clap, used to synchronize picture and sound at the start of each take of a motion picture or other video production.

verb

1. (transitive)To cover with clapboards.

   “to clapboard the sides of a house”