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monoscope

American  
[mon-uh-skohp] / ˈmɒn əˌskoʊp /

noun

  1. 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.

Etymology

Origin of monoscope

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

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.