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lie detector

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noun
  1. a polygraph used to determine changes in certain body activities, as blood pressure, pulse, breathing, and perspiration, the results of which may be interpreted to indicate the truth or falsity of a person's answers under questioning.
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Origin of lie detector

An Americanism dating back to 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for lie detector

Historical Examples

  • He examined the indicators of the lie-detector with great care.

    Lost in Translation

    Larry M. Harris

  • The Ruler flashed a look at the technicians handling the lie-detector.

    Lost in Translation

    Larry M. Harris

  • It was obviously a form of lie-detector—and Korvin felt himself marveling again at this race.

    Lost in Translation

    Larry M. Harris

  • They needed no words; the lie-detector was telling them, perfectly obviously, that he was speaking the truth.

    Lost in Translation

    Larry M. Harris

  • Korvin's guards were standing around doing nothing of importance now that their captor was strapped down in the lie-detector.

    Lost in Translation

    Larry M. Harris


British Dictionary definitions for lie detector

lie detector

noun
  1. a polygraph used esp by a police interrogator to detect false or devious answers to questions, a sudden change in one or more involuntary physiological responses being considered a manifestation of guilt, fear, etcSee polygraph (def. 1), galvanic skin response
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

lie detector in Medicine

lie detector

n.
  1. A polygraph used to detect possible deception during an interrogation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.