detector

(dē tektər, di-; also, esp.for 2 & 3, dētek′-)

noun

  1. a person or thing that detects
  2. an apparatus or device for indicating the presence of something, as electric waves
  3. demodulator

See detector in American Heritage Dictionary 4

noun
One that detects, especially a mechanical, electrical, or chemical device that automatically identifies and records or registers a stimulus, such as an environmental change in pressure or temperature, an electric signal, or radiation from a radioactive material.

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