What is the meaning of Polygraph?

A device which measures and records several physiological variables such as blood pressure, heart rate, respiration and skin conductivity while a series of questions is being asked to a subject, in an attempt to detect lies.

A mechanical instrument for multiplying copies of a writing, resembling multiple pantographs.

A collection of different works, either by one or several authors.

A group of letters that represent a single phoneme.

Any group of letters treated as a single item.

An author who writes on many subjects.

A multidimensional directed graph; a computad.

To administer a polygraph test to.

Source: wiktionary.org