X-ray-tube meaning

A vacuum tube containing electrodes that accelerate electrons and direct them to a metal anode, where their impacts produce x-rays.
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An evacuated tube containing a metal target that is bombarded by electrons from a cathode and that subsequently emits X-rays.
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A device that produces X-rays by directing energetic electrons into a metal target.

The dentist aimed the X-ray tube at my mouth to find the cavity.

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