Definition of polygraph in English:

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Pronunciation: /ˈpälēˌɡraf/


1A machine designed to detect and record changes in physiological characteristics, such as a person’s pulse and breathing rates, used especially as a lie detector.
Example sentences
  • Lie-detector technology has moved on from cumbersome polygraphs that measure physiological responses to questions.
  • He invented a lie-detecting machine called the polygraph.
  • Traditional lie detectors, known as polygraphs, measure heart and respiratory rates as a person answers questions.
1.1A lie-detector test carried out with a polygraph.
Example sentences
  • And Johnny Skakel, his brother, who was one of those witnesses, was tested by polygraph and passed the polygraph.
  • They've gone in and they've passed the polygraphs, and they've done the right thing.
  • Now the only thing we know about polygraphs is if you pass the first one, you don't get a second one.



Pronunciation: /ˌpäliˈɡrafik/
Example sentences
  • Marston was a psychologist who paved the way for the polygraphic lie detector test: most authorities on the comic, and indeed Marston himself, don't deny his fascination with strong women.
  • The polygraphic recordings were analyzed at 30-second intervals and classified as NREM sleep, REM sleep, or undetermined sleep according to recommended criteria.
  • Chart speed was 5 mm/sec, and polygraphic records were scored by hand.
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