double flash
The English word “double flash” has 2 meanings listed here.
noun
- The characteristic visual phenomenon produced by the atmospheric detonation of a nuclear weapon, consisting of a very brief, bright flash of light which dims rapidly, followed by a second, gradually brightening flash.
- A system using two flash separators to separate phases of a working fluid.
Etymology
From double + flash.
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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.