D defs.my
Entry 3 senses Webster, 1913

Washboard

/wäsh'-bôrdˌ/ · Wash·board · IPA /wˈɑʃbˌɔrd/
01 n. A fluted, or ribbed, board on which clothes are rubbed in washing them.
  1. 1.
    A fluted, or ribbed, board on which clothes are rubbed in washing them.
  2. 2.
    A board running round, and serving as a facing for, the walls of a room, next to the floor; a mopboard.
  3. 3.
    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.(Naut.) Also: wasteboard