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

Keep scrolling for more

Synonyms for lie detector

Synonyms

Visit the Thesaurus for More 

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 Tonight also features the results of lie detector tests, and the results are sure to stir up the house. Katey Clifford, al, "How to watch the season finale of ‘Marriage Boot Camp: Hip Hop Edition’ | Live stream, TV channel, time," 3 Sep. 2020 Less innocuous activities include spy craft lessons with explosions and lie detector tests. Shaena Montanari, The Arizona Republic, "'My Spy' is a predictable addition to the spy comedy genre. But Dave Bautista makes it fun," 25 June 2020 Monday night, the attorney for the man who took the video of Abery's shooting told a news conference his client has taken a lie detector test, reports CBS Jacksonville affiliate WJAX-TV. CBS News, "Video shows officer trying to tase Ahmaud Arbery in 2017," 19 May 2020 Although King failed a lie detector test, this was not discussed at trial. Dallas Morning News, "Texas courts allow hypnosis despite science, overturned convictions," 9 Apr. 2020 So far courts have rejected fMRI lie detectors as evidence. Theodor Schaarschmidt, Scientific American, "The Art of Lying," 11 July 2018 From today’s perspective, this reasoning seems a bit overdramatic; even the latest lie detectors do not have that ability. Theodor Schaarschmidt, Scientific American, "The Art of Lying," 11 July 2018 Simmons has unequivocally denied any wrong doing and admitted to passing nine lie detector tests. Cori Murray, Essence, "Oprah Winfrey Cites Creative Differences Over Sexual Assault Documentary Set To Premiere At Sundance," 11 Jan. 2020 The men took out a black box that Dzhabrailov presumed was a lie detector but that turned out to be a machine that delivered electric shocks. Katy Steinmetz, Time, "A Victim of the Anti-Gay Purge in Chechnya Speaks Out: 'The Truth Exists'," 26 July 2019

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.

See More

First Known Use of lie detector

1909, in the meaning defined above

Keep scrolling for more

Learn More about lie detector

Time Traveler for lie detector

Time Traveler

The first known use of lie detector was in 1909

See more words from the same year

Statistics for lie detector

Cite this Entry

“Lie detector.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lie%20detector. Accessed 29 Nov. 2020.

Keep scrolling for more

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 How to pronounce lie detector (audio) \

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

More from Merriam-Webster on lie detector

Thesaurus: All synonyms and antonyms for lie detector

Britannica.com: Encyclopedia article about lie detector

Comments on lie detector

What made you want to look up lie detector? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

A Thanksgiving Word Quiz

  • a traditional thanksgiving dinner
  • November comes from a word for which of the following numbers?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!