A ballistocardiograph is an instrument which measures ballistic forces on the heart, producing a graphical representation of repetitive motions of the human body arising from the sudden ejection of blood itno the great vessels with each heartbeat.
A ballistocardiogram is the visual output of a ballistocardiograph - a machine which measures ballistic forces on the heart.
The longest one that -I- know would be ballistocardiograph which is an instrument for detecting body movements caused by heartbeat.
ballistocardiograph means instrument for detecting body movements caused by heartbeat
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