You know what it looks like… but what is it called?
TAKE THE QUIZ“ray tube”
The following 4 entries include the term ray tube.
cathode-ray tube
noun: a vacuum tube in which a beam of electrons is projected on a phosphor-coated screen to produce a luminous spot at a point on the screen determined by the effect on the electron beam of a variable magnetic field within the tube
X-ray tube
noun: a vacuum tube in which a concentrated stream of electrons strikes a metal target and produces X-rays
electron-ray tube
nounroentgen-ray tube
noun: x-ray tube
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Merriam-Webster unabridged
