follow Dictionary.com

What's the "een" in Halloween?

lie detector

noun
1.
a polygraph used to determine changes in certain body activities, as blood pressure, pulse, breathing, and perspiration, the results of which may be interpreted to indicate the truth or falsity of a person's answers under questioning.
Origin
1905-1910
1905-10, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for lie detector
  • From chewing rice to scanning brains, the perfect lie detector remains elusive.
British Dictionary definitions for lie detector

lie detector

noun
1.
a polygraph used esp by a police interrogator to detect false or devious answers to questions, a sudden change in one or more involuntary physiological responses being considered a manifestation of guilt, fear, etc See polygraph (sense 1), galvanic skin response
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
lie detector in Medicine

lie detector n.
A polygraph used to detect possible deception during an interrogation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Word of the Day

Difficulty index for lie detector

Few English speakers likely know this word

Word Value for lie

3
4
Scrabble Words With Friends

Quotes with lie detector

Nearby words for lie detector