Meaning & use
polygraph
A device that records physical changes such as heart rate and breathing, often used to try to detect lying.
See it in a sentence
The suspect agreed to take a polygraph test to prove he was telling the truth.
Polygraph results are not always accepted as evidence in court.
A note on using this word
Polygraph results are controversial because the test measures stress, not lying directly, and can be misleading.
Words with a similar meaning
lie detector
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