polygraph definition by Webster's New World
- an early device for reproducing writings or drawings
- an instrument for recording simultaneously changes in blood pressure, respiration, pulse rate, etc.
Origin: Classical Greek polygraphos, writing much: see poly- and amp; -graph
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- polygraphic adjective
polygraph definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An instrument that simultaneously records changes in physiological processes such as heartbeat, blood pressure, and respiration, often used as a lie detector.transitive verb pol·y·graphed, pol·y·graph·ing, pol·y·graphs
To test (a criminal suspect, for example) with a polygraph.
- po·lygˈra·pher , po·lygˈra·phist noun
- polˌy·graphˈic adjective
polygraph - Medical Definition
An instrument that simultaneously records changes in physiological processes such as heartbeat, blood pressure, and respiration.