Definition of "cathode-ray tube" []

• A vacuum tube in which a hot cathode emits electrons that are accelerated as a beam through a relatively high voltage anode, further focused or deflected electrostatically or electromagnetically, and allowed to fall on a phosphorescent screen. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Tom went to his own laboratory where he replaced the cathode-ray tube in the oscillograph with another one which he knew to be more sensitive."
• "He was working with a cathode-ray tube surrounded by sheets of black cardboard when he caught a glimpse of light from the other side of his lab."