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electron-ray tube

[ih-lek-tron-rey] /ɪˈlɛk trɒnˌreɪ/
noun, Electronics.
1.
a small cathode-ray tube having a fluorescent screen on which the pattern varies with the voltage applied to the grid: used chiefly in radio receivers to indicate accuracy of tuning.
Also called electric eye.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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