-raf, -rȧf noun
or cy·mo·graph ˈsī-
Etymology: International Scientific Vocabulary cym- + -graph
1. : a recording device including an electric motor or clockwork that drives a usually slowly revolving drum which carries a roll of plain or smoked paper and also having an arrangement for tracing on the paper by means of a stylus a graphic record of motion or pressure (as of the organs of speech, blood pressure, or respiration) often in relation to particular intervals of time
2. : a device for recording on a moving X-ray film the motion of an organ (as the heart) by means of a series of still images
• ky·mo·graph·ic | ̷ ̷ ̷ ̷|grafik adjective