Definify.com
Webster 1913 Edition
Weatherboard
Weath′er-boardˊ
,Noun.
1.
(Naut.)
(a)
That side of a vessel which is toward the wind; the windward side.
(b)
A piece of plank placed in a porthole, or other opening, to keep out water.
2.
(a)
(Arch.)
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.
(b)
A clapboard or feather-edged board used in weatherboarding.