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Flash

1. A pool.

2. (Science: 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.

(Science: mechanics) flash wheel, 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.

Origin: oe. Flasche, flaske; cf. OF. Flache, f. Flaque.