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8 Wintry Words to Defrost Your Vocabulary

first heart sound

first heart sound in Medicine

first heart sound n.
The heart sound that occurs with ventricular systole and is produced mainly by closure of the atrioventricular valves.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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