monoscope

American

[mon-uh-skohp] / ˈmɒn əˌskoʊp /

noun

a cathode-ray tube that provides a signal of a fixed pattern, formerly used for testing television equipment at the end of a broadcast day.

First recorded in 1935–40; mono- + -scope

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