first heart sound

n.

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

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a granular metamorphic rock.
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Words nearby first heart sound

first floor, first four ships, first fruits, first gentleman, first hand, first heart sound, first in war, first in peace, and first in the hearts of his countrymen, first intention, first international, first lady, first language
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.