lie detector

noun
Updated on: 10 Nov 2017

Definition of lie detector

: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

  1. The murder suspect failed a lie detector test.

  2. hooked the suspect up to a lie detector before interrogating him about the robbery

Recent Examples of lie detector from the Web

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.

First Known Use of lie detector

1909

lie detector Synonyms

Synonyms
polygraph

LIE DETECTOR Defined for English Language Learners

lie detector

noun

Definition of lie detector for English Language Learners

  • : 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


Medical Dictionary

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

Law Dictionary

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


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

marked by intense feeling

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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!