kymograph

noun

1. an instrument for measuring and graphically recording variations in fluid pressure, as those of the human pulse.

noun

1. med a rotatable drum for holding paper on which a tracking stylus continuously records variations in blood pressure, respiratory movements, etc
2. phonetics this device as applied to the measurement of variations in the muscular action of the articulatory organs
3. an instrument for recording the angular oscillations of an aircraft in flight

n.

1. An instrument for recording variations in pressure, as of the blood, or in tension, as of a muscle, by means of a pen or stylus that marks a rotating drum.