A device that displays signals on a computer screen(noun)
WordNet. Princeton University. 2010.
Use "computer monitor" in a sentence
"Now watch as your computer monitor morphs into a complex map of small green and black squares, each demarcating a hazardous-waste or toxic-release site within a few square blocks in Buffalo, New York."
"“Give it up, Hersh,” Abby said as she stared at her computer monitor and pictures of the Shippman wedding."
"As Dr. Buttons droned on for the press, the phone next to Wendy's computer monitor warbled."