- an early device for reproducing writings or drawings
- an instrument for recording simultaneously changes in blood pressure, respiration, pulse rate, etc.
Origin: Gr polygraphos, writing much: see poly- and amp; -graph
- polygraphic adjective
Used by arrangement with John Wiley & Sons, Inc.
- po·lygˈra·pher , po·lygˈra·phist noun
- polˌy·graphˈic adjective
polygraph - Medical Definition