Weatherboard n. : That side of a vessel which is toward the wind; the windward side.

Weatherboard n. : A piece of plank placed in a porthole, or other opening, to keep out water.

Weatherboard n. : A board extending from the ridge to the eaves along the slope of the gable, and forming a close junction between the shingling of a roof and the side of the building beneath.

Weatherboard n. : A clapboard or feather-edged board used in weatherboarding.

Example:
What is the difference between Weatherboards from CertainTeed and material from James Hardie siding?

Taxonomy
weatherboarding, boards, heart, free encyclopedia, weatherboard, timber cladding, wood, pigments, Weatherboard houses, search, been suggested that this article, one another, horizontally, the wall, parallel sides, horizontal sections, North American, riven.

Defination from the web:
weatherboards may consist of uPVC boards (Known as Vinyl siding in the U,S,), or other man-made materials. ... Weatherboard houses may be found in most parts of the British Isles, and the style may be part of all types of traditional building, from ...