The Collaborative International Dictionary
Flash wheel
Flash \Flash\, n. [OE. flasche, flaske; cf. OF. flache, F. flaque.]
A pool. [Prov. Eng.]
--Haliwell.-
(Engineering) A reservoir and sluiceway beside a navigable stream, just above a shoal, so that the stream may pour in water as boats pass, and thus bear them over the shoal.
Flash wheel (Mech.), a paddle wheel made to revolve in a breast or curved water way, by which water is lifted from the lower to the higher level.