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monoscope

[ mon-uh-skohp ]
/ ˈmɒn əˌskoʊp /
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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.
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Origin of monoscope

First recorded in 1935–40; mono- + -scope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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