Noun | 1. | ![]() device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water" metal detector - detector that gives a signal when it detects the presence of metal; used to detect the presence of stray bits of metal in food products or to find buried metal mine detector - detector consisting of an electromagnetic device; used to locate explosive mines electric eye, magic eye, photocell, photoconductive cell, photoelectric cell - a transducer used to detect and measure light and other radiations trace detector - a screening device for traces of explosives; used at airline terminals |