double flash

/D AH1 B AH0 L F L AE0 SH/
noun
  1. 1

    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.

  2. 2

    (engineering) A system using two flash separators to separate phases of a working fluid.

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