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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.

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Word History and Origins

Origin of light valve1

First recorded in 1925–30

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Example Sentences

It will be noticed that a light valve-spring is shown in drawing.

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light uplight verse

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