\Weath"er*board`\, n.
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.