D defs.my
Entry 3 senses Webster, 1913

Polygraph

/päl'-ēgˌ-răfˌ/ · Pol·y·graph · IPA /ˈpɒliɡɹæf/
01 n. An instrument for multiplying copies of a writing; a manifold writer; a copying machine.
  1. 1.
    An instrument for multiplying copies of a writing; a manifold writer; a copying machine.
  2. 2.
    In bibliography, a collection of different works, either by one or several authors.
  3. 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 Also: lie detector