Meaning of flashboard

flash•board

Pronunciation: (flash'bôrd", -bōrd"), [key]
— n. Civ. Engin.
  1. a board, or one of a series of boards, as on a milldam, used to increase the depth of the impounded water.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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