polygraph
/ˈpɑlɪˌɡræf/
noun
- A machine that measures and records a person's physical responses (such as heart rate, blood pressure, and sweating) to determine if they are telling the truth; also called a lie detector.
- The suspect agreed to take a polygraph test to prove his innocence.
- The spy was trained to control his breathing and heart rate to fool the polygraph.
- Many courts do not allow polygraph results as evidence because they can be unreliable.
verb
- To test someone using a polygraph (lie detector).
- The detective polygraphed the witness to verify her story.
- They polygraph job applicants only for positions involving classified information.
- The company decided to polygraph all new employees in the security division.