metal detector

WordReference Random House Unabridged Dictionary of American English © 2025

met′al detec′tor, 

1. Electronics 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.

Collins Concise English Dictionary © HarperCollins Publishers::

metal detector noun

1. 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