Polygraph

Definition of Polygraph

Pol´y`graph

n.	1.	An instrument for multiplying copies of a writing; a manifold writer; a copying machine.
	2.	In bibliography, a collection of different works, either by one or several authors.
	3.	An instrument for detecting deceptive statements by a subject, by measuring several physiological states of the subject, such as pulse, heartbeat, and sweating. The instrument records these parameters on a strip of paper while the subject is asked questions designed to elicit emotional responses when the subject tries to deceive the interrogator. Also called lie detector

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