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
First recorded in 1925–30
Words nearby light valve
light table,
light therapy,
light trap,
light treatment,
light up,
light valve,
light verse,
light water,
light weight,
light welterweight,
light year