lie detector

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noun
  1. a polygraph used to determine changes in certain body activities, as blood pressure, pulse, breathing, and perspiration, the results of which may be interpreted to indicate the truth or falsity of a person's answers under questioning.

Origin of lie detector

1
An Americanism dating back to 1905–10

Words Nearby lie detector

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How to use lie detector in a sentence

British Dictionary definitions for lie detector

lie detector

noun
  1. a polygraph used esp by a police interrogator to detect false or devious answers to questions, a sudden change in one or more involuntary physiological responses being considered a manifestation of guilt, fear, etc: See polygraph (def. 1), galvanic skin response

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