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light valve

noun, Electricity.
1.
a light-transmitting device having transmissions that vary in accordance with an electric input, as voltage, current, or an electron beam, used chiefly for recording sound on motion-picture film.
Origin of light valve
1925-1930
First recorded in 1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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