(1):

(n.) A board placed on the fore part of a carriage, sleigh, or other vehicle, to intercept water, mud, or snow, thrown up by the heels of the horses; - in England commonly called splashboard.

(2):

(n.) The float of a paddle wheel.

(3):

(n.) A screen at the bow af a steam launch to keep off the spray; - called also sprayboard.