polygraph

• POS: Noun
• HYPHEN: pol=y=graph

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]

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.