light valve

noun Electricity.
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:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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And sometimes that's a shut-off valve, and sometimes it's the pilot light valve of a water heater.
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