polygraph

poly·graph

noun \ˈpäl-i-ˌgraf\

Definition of POLYGRAPH

: an instrument for simultaneously recording variations of several different pulsations (as of the pulse, blood pressure, and respiration)—see lie detector

—poly·graph·ic \ˌpäl-i-ˈgraf-ik\ adjective

—poly·graph·i·cal·ly \-i-k(ə-)lē\ adverb