electron-ray tube

American

[ih-lek-tron-ray] / ɪˈlɛk trɒnˌreɪ /

noun

Electronics.

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.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023