Definitions

1. noun

An instrument for recording and measuring the physical responses to a series of questions, typically used in lie detection.

“The suspect was subjected to a polygraph test to determine his involvement in the crime.”

2. noun

A device for recording or measuring the physiological responses of an organism, especially in relation to sound waves or other stimuli.

“The polygraph was used to study the hearing patterns of the animal.”

3. verb

To write or record in a polygraph.

“The technician polygraphed the suspect’s responses to the questions.”