Dictionary

lie detector

noun

: 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

Full Definition of LIE DETECTOR

:  a polygraph for detecting physiological evidence (as change in heart rate) of the tension that accompanies lying

Examples of LIE DETECTOR

  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

Related to LIE DETECTOR

Synonyms
polygraph

Rhymes with LIE DETECTOR

lie detector

noun \ˈlī-di-ˌtek-tər\   (Medical Dictionary)

Medical Definition of LIE DETECTOR

:  a polygraph for detecting physiological evidence (as change in heart rate) of the tension that accompanies lying

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