polygraph

1. 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 posed to a subject, in an attempt to detect deception.
2. A mechanical instrument for multiplying copies of a writing, resembling multiple pantographs. (dated)
3. A group of letters that represent a single phoneme.
4. Any group of letters treated as a single item.
5. An author who writes on many subjects.
6. A multidimensional directed graph.

الجمع polygraphs