metal-detector

metal detector

noun
an electronic device for detecting the presence of metal objects, as one used as a portable sweeping unit or one emplaced in an archway at an airport terminal to detect concealed weapons, explosives, etc.
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World English Dictionary
metal detector
 
n
a device that gives an audible or visual signal when its search head comes close to a metallic object embedded in food, buried in the ground, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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