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EnglishEdit

 
A medieval lie detector
 
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NounEdit

lie detector ‎(plural lie detectors)

  1. (informal) A polygraph, a device which measures and records several physiological variables such as blood pressure, heart rate, respiration and skin conductivity while a series of questions is being asked to a subject, in an attempt to detect lies.

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See alsoEdit

 
chart recorder often used with a
lie detector