from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An instrument designed to detect when a person has answered a question falsely.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun informal A
polygraph, a devicewhich measures and records several physiologicalvariables such as blood pressure, heart rate, respirationand skin conductivity while a series of questions is being asked to a subject, in an attempt to detect lies.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a polygraph that records bodily changes sometimes associated with lying
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