Lie-detector meaning

An instrument designed to detect when a person has answered a question falsely.
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A polygraph used on persons suspected of lying: it records certain physiological changes assumed to occur when the subject lies in answering questions.
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(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.
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