Found 2 items, similar to flashboard.
English → English (WordNet) Definition: flashboard flashboard n : boarding place along the top of a dam to increase its height [syn: flashboarding]
English → English (gcide) Definition: Flashboard Flashboard \Flash"board`\, n. A board placed temporarily upon a milldam, to raise the water in the pond above its usual level; a flushboard. [U.S.] [1913 Webster]