splashboard

(splas̸hbôrd′)

noun

  1. any screen or board protecting riders on a vehicle from being splashed in wet weather
  2. a screen to keep water from splashing onto the deck of a boat
  3. a trap for closing a sluice or spillway

See splashboard in American Heritage Dictionary 4

noun
  1. A structure that protects the upper part of a vehicle from splashes of mud.
  2. Nautical A screen on a boat to keep water from splashing onto the deck.
  3. A board for closing a spillway or sluice.
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