"cardiographs" in the noun sense
1. cardiograph, electrocardiograph
medical instrument that records electric currents associated with contractions of the heart
2. ballistocardiograph, cardiograph
a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles
Source: WordNet® (An amazing lexical database of English)
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