polygraph
n. countable C1 Advanced US //ˈpɑˌɫiˌɡɹæf// UK //pˈɒlɪɡɹˌæf// poly·graph
n. a machine that measures your heart rate, breathing, and sweat to see if you are lying. It is often used in police investigations or security checks.
n. an instrument used to record physiological responses such as heart rate, blood pressure, and respiration, typically to detect deception. Often used in forensic or security contexts.
The suspect agreed to take a polygraph test.
Despite the widespread use of the polygraph in popular media, many legal experts still question its reliability as a definitive tool for detecting lies.
The defendant's attorney argued that the results of the polygraph were inadmissible in court, citing the lack of scientific consensus regarding the physiological indicators of deception.
From poly- + -graph.