Definitions from Wiktionary (polygraph)

▸ noun:  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.
▸ noun:  (dated) A mechanical instrument for multiplying copies of a writing, resembling multiple pantographs.
▸ noun:  (archaic) A collection of different works, either by one or several authors.
▸ noun:  (linguistics) A group of letters that represent a single phoneme.
▸ noun:  Any group of letters treated as a single item.
▸ noun:  An author who writes on many subjects.
▸ noun:  (mathematics) A multidimensional directed graph; a computad.
▸ verb:  (transitive) To administer a polygraph test to.

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