detector

[dih-tek-ter]
noun
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.

Origin:
1535–45; < Late Latin dētēctor revealer, equivalent to Latin dēteg(ere) to uncover, reveal (see detect) + -tor -tor

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
detector (dɪˈtɛktə)
 
n
1.  a person or thing that detects
2.  any mechanical sensing device
3.  electronics a device used in the detection of radio signals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

detector
1540s, from L. detector "uncoverer, revealer," from detectus, pp. of detegere (see detect).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
From chewing rice to scanning brains, the perfect lie detector remains elusive.
The detector was tiny by today's standards, but it still managed to spot
  neutrinos-three an hour.
Place subatomic particles-pion or muons-on one side of the light cylinder, and
  a particle detector on the other side.
As he walked, sweeping his metal detector from side to side, he noticed a
  slight elevation.
Image for detector
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