One of the mysteries of the English language finally explained.
1Photography. Produced by means of or involving two or more flashbulbs or flash units operated in rapid succession, so that the resulting photograph shows successive positions of an action sequence.
2Designating a process or apparatus for desalinating sea water in several stages in which water is converted suddenly into steam at successively lower pressures.
1930s; earliest use found in Photo Technique. From multi- + flash.
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