(1):

(n.) A clapboard or feather-edged board used in weatherboarding.

(2):

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

(3):

(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.

(4):

(n.) That side of a vessel which is toward the wind; the windward side.