second heart sound
n.
The heart sound that signifies the beginning of diastole and is caused by closure of the semilunar valves.
Words nearby second heart sound
sulfide,
sulfinpyrazone,
sulfinyl,
sulfinyl group,
sulfisoxazole,
second heart sound,
sulfite oxidase,
sulfite paper,
sulfite process,
sulfite pulp,
sulfiting agent