Wiktionary:Word of the day/2022/September 29

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circulatory system n

(physiology) The parts of an animal body comprising the heart, blood vessels (arteries, veins, and capillaries), and blood, which circulate the blood around the body. [from mid 19th c.] (technology) The parts of a machine responsible for the circulation of some fluid. Today is World Heart Day, which was established by the World Heart Federation to highlight the fact that heart disease and stroke are the world’s leading causes of death, and the importance of heart health.

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