"lie detector." YourDictionary, n.d. Web. 10 December 2018. <https://www.yourdictionary.com/lie-detector>.
lie detector. (n.d.). Retrieved December 10th, 2018, from https://www.yourdictionary.com/lie-detector
(plural lie detectors)
(informal) A polygraph, 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.
English Wiktionary. Available under CC-BY-SA license.