polygraph Meaning, Definition & Usage

  1. noun a medical instrument that records several physiological processes simultaneously (e.g., pulse rate and blood pressure and respiration and perspiration)

WordNet

Pol"y*graph noun
Etymology
Gr. writing much; much, many + to write: cf. F. polygraphe.
Definitions
  1. An instrument for multiplying copies of a writing; a manifold writer; a copying machine.
  2. In bibliography, a collection of different works, either by one or several authors. Brande & C.

Webster 1913