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flashboard

[flash-bawrd, -bohrd] /ˈflæʃˌbɔrd, -ˌboʊrd/
noun, Civil Engineering
1.
a board, or one of a series of boards, as on a milldam, used to increase the depth of the impounded water.
Origin of flashboard
1760-1770
1760-70; flash + board
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for flashboard

flashboard

/ˈflæʃˌbɔːd/
noun
1.
a board or boarding that is placed along the top of a dam to increase its height and capacity Also called stop log, stop plank
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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