lie detector

noun

Definition of lie detector 

: a polygraph for detecting physiological evidence (such as change in heart rate) of the tension that accompanies lying

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Synonyms for lie detector

Synonyms

polygraph

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Examples of lie detector in a Sentence

The murder suspect failed a lie detector test. hooked the suspect up to a lie detector before interrogating him about the robbery

Recent Examples on the Web

For years, many employers required applicants to undergo lie detector tests to order to land a job. Sandee Lamotte, CNN, "The shaky science of lie detectors," 21 Mar. 2018 His most recent comments regarding my client, who passed a lie detector test and who the American people believe, are disgusting and a disgrace. Sarah Gray, Fortune, "Rudy Giuliani Defends Controversial Comments About Stormy Daniels," 7 June 2018 His most recent comments regarding my client, who passed a lie detector test and who the American people believe, are disgusting and a disgrace. Lisa Ryan, The Cut, "Giuliani Says Stormy Daniels Doesn’t Have Any Credibility Because She’s a Porn Star," 7 June 2018 His most recent comments regarding my client, who passed a lie detector test and who the American people believe, are disgusting and a disgrace. Sarah Gray, Fortune, "Rudy Giuliani Defends Controversial Comments About Stormy Daniels," 7 June 2018 His most recent comments regarding my client, who passed a lie detector test and who the American people believe, are disgusting and a disgrace. Sarah Gray, Fortune, "Rudy Giuliani Defends Controversial Comments About Stormy Daniels," 7 June 2018 His most recent comments regarding my client, who passed a lie detector test and who the American people believe, are disgusting and a disgrace. Lisa Ryan, The Cut, "Giuliani Says Stormy Daniels Doesn’t Have Any Credibility Because She’s a Porn Star," 7 June 2018 According to the affidavit, Kevin Brown volunteered to take a lie detector test. CBS News, "Were the murders of California teens the work of a serial killer?," 9 June 2018 His most recent comments regarding my client, who passed a lie detector test and who the American people believe, are disgusting and a disgrace,’’ Avenatti said. Michael Balsamo, BostonGlobe.com, "Giuliani says Stormy Daniels has ‘no reputation,’ affair not credible," 7 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'lie detector.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of lie detector

1909, in the meaning defined above

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Last Updated

7 Oct 2018

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Time Traveler for lie detector

The first known use of lie detector was in 1909

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More Definitions for lie detector

lie detector

noun

English Language Learners Definition of lie detector

: a device used to measure the heart rate, breathing, etc., in order to find out if someone (such as a person suspected of a crime) is being honest

lie detector

noun
\ˈlī-di-ˌtek-tər \

Medical Definition of lie detector 

: a polygraph for detecting physiological evidence (as change in heart rate) of the tension that accompanies lying

lie detector

noun
lie de·tec·tor

Legal Definition of lie detector 

: an instrument for detecting physiological evidence of the tension that accompanies lying — compare polygraph

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