Pronunciation: (di-tek'tur),[key] —n. 1. a person or thing that detects.
2. a device for detecting smoke, fire, or some other hazardous condition.
3. a device for detecting the presence of metal, contraband, or other items that might be hidden or concealed.
4. Telecommunications. a. a device for detecting electric oscillations or waves.
b. a device, as a crystal detector or a vacuum tube, that rectifies the alternating current in a radio receiver.