/ Dictionary / Index P polygraph: Meaning and Definition of Find definitions for: pol•y•graph Pronunciation: (pol'i-graf", -gräf"), [key] — n. an instrument for receiving and recording simultaneously tracings of variations in certain body activities. a test using such an instrument to determine if a person is telling the truth. See an apparatus for producing copies of a drawing or writing. a prolific or versatile author. —v.t. to test (a person) with a polygraph. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polygraph (Thesaurus) polygonaceous polygynist Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language