A vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen WordNet 3.0 & Open English WordNet

A Cathode–Ray Tube is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. Wikipedia

A component used in display devices such as televisions Wikipedia Disambiguation

Electron tube which can display television pictures OmegaWiki

A vacuum tube in which electrons from a heated cathode are focused and deflected onto a phosphorescent screen; used in television sets etc. Wiktionary

A vacuum tube that displays still or moving images (such as for a television), by controlling the direction of a cathode ray emitted towards the front of the tube. The front is coated by a layer of fluorescent material, so that it emits light when struck by the beam. Wiktionary

Vacuum tube that displays images. Wiktionary (translation)