Etymology
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detector (n.)

1540s, "one who detects," from Latin detector "uncoverer, revealer," agent noun from detectus, past participle of detegere "to uncover, expose," figuratively "discover, reveal, disclose" (see detect). From 1833 as "instrument or device for indicating the presence or state of a thing," originally an arrangement in a lock supposed to indicate attempts to tamper with it.

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Definitions of detector

detector (n.)
any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner;
Synonyms: sensor / sensing element
detector (n.)
rectifier that extracts modulation from a radio carrier wave;
Synonyms: demodulator
detector (n.)
electronic equipment that detects the presence of radio signals or radioactivity;
From wordnet.princeton.edu