Polygraph meaning : A device which measures and records several physiological variables such as blood pressure, heart rate, respiration and skin conductivity while a series of questions is being asked to a subject, in an attempt to detect lies. A mechanical instrument for multiplying copies of a writing, resembling multiple pantographs. A collection of different works, either by one or several authors. A group of letters that represent a single phoneme. To administer a polygraph test to.