lie detector

noun

Definition of lie detector

  1. :  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

First Known Use of lie detector

1909


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

play
noun \ˈlī-di-ˌtek-tər\

Medical Definition of lie detector

  1. :  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

  1. :  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

lacking social experience or grace

Get Word of the Day daily email!

Test Your Vocabulary

The Emoji Quiz

  • emoji-the-quiz
  • What phase of the moon is this: 🌖 ?
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!