First heart sound
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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noun, Logic. 1. See under (def 5a). [in-ten-shuh n] /ɪnˈtɛn ʃən/ noun 1. an act or instance of determining mentally upon some action or result. 2. the end or object intended; purpose. 3. intentions. 4. the act or fact of intending. 5. Logic. 6. Surgery, Medicine/Medical. a manner or process of healing, as in the […]
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noun 1. (often initial capital letters) the wife of the president of the U.S. or of the governor of a state. 2. the wife of the head of any country: the First Lady of Brazil. 3. the foremost woman in any art, profession, or the like: first lady of the American theater. noun (often capitals) […]
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noun, Physics. 1. See under . noun, Physics. 1. any of three laws of classical mechanics, either the law that a body remains at rest or in motion with a constant velocity unless an external force acts on the body (first law of motion) the law that the sum of the forces acting on a […]