Wēath’er-bōard1, n.
n. 1. (Naut.) (a.) That side of a ship which is toward the wind; the windward side. (b.) A piece of plank placed in the ports of a ship, when laid up in ordinary, and serving as a protection from bad weather. Mar. Dict.
Sense 2. (Arch.) A board extending from the ridge to the eaves, and forming a close junction between the shingling of a roof and the side of the building beneath, usually at the ends where there is no cornice.