flash·board

[flash-bawrd, -bohrd]
noun Civil Engineering.
a board, or one of a series of boards, as on a milldam, used to increase the depth of the impounded water.

Origin:
1760–70; flash + board

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World English Dictionary
flashboard (ˈflæʃˌbɔːd) [Click for IPA pronunciation guide]
 
n
stop log, Also called: stop plank a board or boarding that is placed along the top of a dam to increase its height and capacity

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Flashboard is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
There is a problem with the flashboard and its lights.
Flashboard type risers can be full-round pipe risers or half-round pipe risers.
Prefabricated inlet and inline box type flashboard risers.
To conduct slow drawdowns with flashboard risers, boards are removed one at a
  time, on intervals of three or four days.
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