flashboards

Noun

flashboard (plural flashboards)

1. (US) A board placed temporarily upon a dam, river, stream, etc. (typically within a permanent frame) to raise the water above its usual level.
   • A form of cheap open weir which has been commonly constructed in the West is the open wooden frame and flashboard weir.1909, Herbert Michael Wilson, Irrigation Engineering, page 168
2. (broadly) A board that controls the flow of any material.
   • There exists a trapezoidal groove in the bottom of each container and a flashboard fixed in feeding system which match the groove.2010, Honghai Liu, Han Ding, Zhenhua Xiong, Intelligent Robotics and Applications, page 522
3. A sheet of material that is subjected to an electric pulse or flashover in order to produce plasma.
   • The plasma produced by the flashboard was mostly C⁺ and C⁺⁺.1990, B N Breizman, B A Knyazev, High-power Particle Beams, page 373
4. Any automated display that shows temporary information.
   • Thus encroaching telephone wires, angrily projecting one's arm, an overhanging flashboard, or tree, leaning walls, and overhanging roof, projecting eaves and the shooting of guns have all been regarded as invasions of the superincumbent airspace — the exclusive realm of the landownder.1957, The Journal of Air Law and Commerce - Volume 24, page 132
   1. An electronic display that shows the winning values in various gambling games such as keno or bingo.
      • The holder of a ticket that contains a match of all the numbers on any one of the Player's Cards to the numbers on the Flashboard card using the 48 Flashboard card numbers and the 49th and 50th Bonus Balls shall be entitled to a prize of $50.1996, Florida Administrative Weekly - Volume 22, Issues 47-52, page 7028
5. An acrylic board used to display children's work in a school.

See all 8 meanings of flashboard