monoscope

[mon-uh-skohp]

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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. 2018