One of the mysteries of the English language finally explained.
1A form of evaporative cooling in which the coolant is distributed as a thin film on a surface to increase the rate of evaporation.
2A technique by which an object (typically a turbine or part of an engine) is protected from the heat of its surroundings by an enveloping film of insulating gas.
Early 20th century; earliest use found in Engineer-in-charge.
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