Metal-detector meaning

A device that senses the presence of metal, especially:
  • A handheld unit used in searching an area for coins or other metal objects.
  • A gatelike structure through which a person passes, used in detecting concealed weapons such as guns and knives.
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A hand-held device that uses electromagnetic induction to detect buried metal.
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A structure, similar to a doorway, through which people pass; an alarm is sounded if the person is carrying a metal object, as this may indicate a weapon.
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Origin of metal-detector