pul·sa·tor \ˌpəlˈsād.ə(r), ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷\noun (-s) Etymology: Latin, from pulsatus + -or 1.: beater, striker 2.: something that beats or throbs in working: as a.: pulsometer b.: a device for producing pulsations in a reaction chamber by periodic discharges of gas or vapor