Keeler polygraph

noun
Kee·​ler polygraph | \"-\

Definition of Keeler polygraph 

: an instrument for making a graphic record of the changes in blood pressure and pulse and respiration rate of someone being questioned under or as if under suspicion of guilt

called also lie detector

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History and Etymology for Keeler polygraph

after Leonarde Keeler †1949 American criminologist, its inventor

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to clear from alleged fault or guilt

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