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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.


(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
References in periodicals archive ?
They developed a sexual assault scenario and added parts of the expert testimony of the polygrapher in the case of U.
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.
The documents provided by the polygrapher, JoMac and Associates, show that the questions asked were regarding the most serious charge of rape.
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.
Investigating officer is present at the polygraph: The investigating officer observes the polygraph and assists the polygrapher as needed.