plural CRTs or CRT's
: cathode-ray tube
also : a display device incorporating a cathode-ray tube

Word History

First Known Use

1941, in the meaning defined above

Time Traveler
The first known use of CRT was in 1941

Browse Nearby Words

Cite this Entry

“CRT.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/CRT. Accessed 9 Jun. 2026.

Medical Definition

CRT

1 of 2 noun
plural CRTs or CRT's
: cathode-ray tube
also : a display device incorporating a cathode-ray tube

CRT

2 of 2 abbreviation
complex reaction time
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