'Washboard' definitions:

Definition of 'washboard'

From: WordNet
noun
Device consisting of a corrugated surface to scrub clothes on
noun
Protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side [syn: washboard, splashboard]

Definition of 'Washboard'

From: GCIDE
  • Washboard \Wash"board`\, n.
  • 1. A fluted, or ribbed, board on which clothes are rubbed in washing them. [1913 Webster]
  • 2. A board running round, and serving as a facing for, the walls of a room, next to the floor; a mopboard. [1913 Webster]
  • 3. (Naut.) A broad, thin plank, fixed along the gunwale of boat to keep the sea from breaking inboard; also, a plank on the sill of a lower deck port, for the same purpose; -- called also wasteboard. --Mar. Dict. [1913 Webster]