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Definition of: polygraph
(pol′i·graf, -gräf) noun
1. A device for reproducing a drawing or writing many times; a copy pad.
2. A mechanism for multiplying a drawing or writing.
3. A versatile or prolific author.
4. A collection of different treatises or books.
5. Med. A device for recording variations in the heartbeat and in respiratory movements: used as a lie detector. Compare PSYCHOGALVANOMETER. [<Gk. polygraphos]
—pol′y·graph′ic or ·i·cal adjective
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