Definition of lie detector in English:

lie detector

Syllabification: lie de·tec·tor

noun

  • An instrument for determining whether a person is telling the truth by testing for physiological changes considered to be associated with lying. Compare with polygraph.
    More example sentences
    • This, to Lily at least, sounded like a good enough answer, one that would definitely qualify under the lie-detector test as the truth.
    • While NSA officials call the lie detector test a useful tool, it is clearly not perfect.
    • Jack questions Greg at every turn, even going so far as to subject him to a lie-detector test and monitoring his every move with hidden surveillance cameras.

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