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An instrument that measures the physiological responses of an individual to questions from an examiner who interprets the results as indicating the likelihood that the individual is telling or not telling the truth in giving the answers.
tr.v. pol·y·graphed, pol·y·graph·ing, pol·y·graphs
To test (a criminal suspect, for example) with a polygraph.

po·lyg′ra·pher (pə-lĭg′rə-fər), po·lyg′ra·phist (-fĭst) n.
pol′y·graph′ic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(pəˈlɪɡrəfə) or


1. a person who employs a code cipher
2. (Printing, Lithography & Bookbinding) printing a device used to copy a document
3. (Literary & Literary Critical Terms) a person who writes multiple works
4. obsolete a person who mimics
5. (Medicine) med a person who operates a lie detector
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
One of the most widely utilized police interrogation techniques, discussed in Miranda and still used currently, is the Reid technique, named after John Reid, a former Chicago police officer and polygrapher. (201) Reid helped popularize the method, which was conceived in 1942 by Northwestern Law School Professor Fred Inbau.
Not only has he proved to be an outstanding investigator; Branks has also managed to become a polygrapher, an accomplishment requiring a lot of his own time and money.
Arizona prosecutor Rachel Mitchell, who questioned Prof Ford during testimony, said she had told a polygrapher the alleged assault happened in the early 80s, then crossed out the word "early".
They developed a sexual assault scenario and added parts of the expert testimony of the polygrapher in the case of U.S v.
Finally, all inmates are required to take a sexual history polygraph, administered by a contracted certified polygrapher, in order to be eligible for the SOT group.
function, a polygrapher administering a polygraph during a police
A polygrapher cannot say definitively that persons have lied, only that they displayed indicators of stress when asked a question.
He is a US certified polygrapher, who's currently trying to introduce lie detection technology to Cyprus.
Rather, the evidence introduced is the expert opinion testimony of the polygrapher about whether the subject was truthful or deceptive in answering questions about the alleged crime.
In the professional opinion of the polygrapher who carried out the test, Michael never carried out any attack.
The fingerprinting expert (comparing the original fingerprints with those on the envelope), the handwriting expert (comparing the original samples with the signed receipt), and the polygrapher (analyzing the tests) sought to identify the perpetrator of each group.