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

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1909

Medical Dictionary

noun \ˈlī-di-ˌtek-tər\

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

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