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

polygraph

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

The president of the White House Boys Organization, Jerry Cooper, has taken a lie detector test to prove his memories of Tidwell’s abuse. Josephine Livingstone, The New Republic, "Colson Whitehead, American Escape Artist," 30 July 2019 And by then more was known of Mr. Perot, who could be thin-skinned and meanspirited, who had subjected employees to moral codes and lie detector tests, who was drawn to conspiracy theories and had hired private detectives to chase his suspicions. Robert D. Mcfadden, New York Times, "Ross Perot, Brash Texas Billionaire Who Ran for President, Dies at 89," 9 July 2019 Hole — the troubled, brilliant protagonist of 11 previous books by Norway’s Jo Nesbø — is both a lady killer and a veritable human lie detector. Scott Timberg, latimes.com, "Nordic noir master Jo Nesbø takes another dark twist with 'Knife'," 10 July 2019 Its training manual—now in its fifth edition—was first published in 1962 by John Reid, a former Chicago detective and lie detector expert, and Northwestern University law professor Fred Inbau. Douglas Starr, Science | AAAS, "This psychologist explains why people confess to crimes they didn’t commit," 13 June 2019 She had been prepared to talk to the police for months, submitting to a lie detector test in September 2017, a week before the Weinstein news broke. Mattie Kahn, Glamour, "Aurora Perrineau Wanted to Be Known as an Actor. Instead, Her Name Got Dragged Into Scandal," 21 May 2019 The lie detector test determined that is a lie (Maury voice). Stephen A. Crockett Jr., The Root, "Trump Just Can't Stop Lying About Crowd Size," 30 Apr. 2018 Since then the couple's been making out publicly all over the country, wearing lots of sweatpants, drinking coffee, and taking lie detector tests. Christopher Rosa, Glamour, "Hailey Baldwin and Justin Bieber May Have Just Confirmed They're Married," 18 Oct. 2018 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

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

Statistics for lie detector

Look-up Popularity

Time Traveler for lie detector

The first known use of lie detector was in 1909

See more words from the same year

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

Rhyming Dictionary: Words that rhyme with 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

friendly or mild

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

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!