sensor

[sen-sawr, -ser]
noun
1.
a mechanical device sensitive to light, temperature, radiation level, or the like, that transmits a signal to a measuring or control instrument.

Origin:
1925–30; sense + -or2

censer, censor, censure, sensor.
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World English Dictionary
sensor (ˈsɛnsə)
 
n
anything, such as a photoelectric cell, that receives a signal or stimulus and responds to it
 
[C19: from Latin sēnsus perceived, from sentīre to observe]

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Etymonline
Word Origin & History

sensor
1958, from an adj. first recorded 1865, shortened from sensory (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sensor sen·sor (sěn'sər, -sôr')
n.

  1. A device, such as a photoelectric cell, that receives and responds to a signal or stimulus.

  2. See sense organ.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Capsaicin stimulates the neural sensors in the tongue and skin that also detect
  rising temperatures.
Lenses and sensors or film cannot do this by themselves.
The yellow sulfur makes the water appear green to the satellite's sensors.
Night-vision cameras, biometric sensors and other gadgets already give snoops
  access to private spaces.
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