lie detector

noun

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

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 Filmed in conjunction with Grande and Erivo’s joint Vanity Fair cover story, the lie detector test also gave the R.E.M. Beauty founder an opportunity to set the record straight on numerous plastic surgery rumors that have followed her over the past couple of years. Hannah Dailey, Billboard, 30 Sep. 2024 And last season’s bonus episode saw cast members take a lie detector test, which divulged that the Oppenheim Group founder still had feelings for Stause. Erin Clements, Peoplemag, 12 Sep. 2024 But while Kyle talked up the accuracy of the lie detectors, they have been called into question since the show was axed almost immediately after Dymond took his own life. Max Goldbart, Deadline, 5 Sep. 2024 And does this critical investigation require a DNA test, a lie detector test, or both? Lorraine Ali, Los Angeles Times, 1 Aug. 2024 See all Example Sentences for lie detector 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'lie detector.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1909, in the meaning defined above

Time Traveler
The first known use of lie detector was in 1909

Dictionary Entries Near lie detector

Cite this Entry

“Lie detector.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lie%20detector. Accessed 31 Oct. 2024.

Kids Definition

lie detector

noun
: an instrument for detecting bodily changes (as an increase in heart rate) that are considered to go along with lying

Medical Definition

lie detector

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

Legal Definition

lie detector

noun
lie de·​tec·​tor
: an instrument for detecting physiological evidence of the tension that accompanies lying compare polygraph

More from Merriam-Webster on lie detector

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