second heart sound

n.

The heart sound that signifies the beginning of diastole and is caused by closure of the semilunar valves.

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Nearby words

sulfide, sulfinpyrazone, sulfinyl, sulfinyl group, sulfisoxazole, second heart sound, sulfite oxidase, sulfite paper, sulfite process, sulfite pulp, sulfitic

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