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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 of light valve
1925-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for light valve
  • And sometimes that's a shut-off valve, and sometimes it's the pilot light valve of a water heater.

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