Definition of polygraph noun from the Oxford Advanced Learner's Dictionary

 

polygraph

 noun
noun
BrE BrE//ˈpɒliɡræf//
 
, also BrE//ˈpɒliɡrɑːf//
 
; NAmE NAmE//ˈpɑːliɡræf//
 
(specialist, formal)
 
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= lie detector
See the Oxford Advanced American Dictionary entry: polygraph

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