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Table of Contents -- polygraph POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

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polygraph

POS

Noun

HYPHEN

pol=y=graph

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WORDNET DICTIONARY

Noun polygraph has 1 sense

polygraph(n = noun.artifact) - a medical instrument that records several physiological processes simultaneously (e.g., pulse rate and blood pressure and respiration and perspiration);

has particulars:

lie detector

is a kind of medical instrument

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CIDE DICTIONARY

polygraph, n. [Gr. writing much; poly`s much, many + to write: cf. F. polygraphe.].

An instrument for multiplying copies of a writing; a manifold writer; a copying machine. [1913 Webster]
In bibliography, a collection of different works, either by one or several authors. Brande & C. [1913 Webster]
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 [1913 Webster]

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OXFORD DICTIONARY

polygraph, n. a machine designed to detect and record changes in physiological characteristics (e.g. rates of pulse and breathing), used esp. as a lie-detector.