[buh-lis-toh-kahr-dee-uh-graf, -grahf]
noun Medicine/Medical.
a device that determines cardiac output by recording the movements of the body caused by contraction of the heart and ejection of blood into the aorta.

1935–40; ballist(ic) + -o- + cardiograph

ballistocardiography [buh-lis-toh-kahr-dee-og-ruh-fee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

ballistocardiograph bal·lis·to·car·di·o·graph (bə-lĭs'tō-kär'dē-ə-grāf')
A device used to determine the volume of blood passing through the heart in a specific period of time and the force of cardiac contraction by measuring the body's recoil as blood is ejected from the ventricles with each heartbeat.

bal·lis'to·car'di·og'ra·phy (-ŏg'rə-fē) n.
The American Heritage® Stedman's Medical Dictionary
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