eustachian valve
noun
often capitalized E
: a crescent-shaped fold of the lining membrane of the heart at the entrance of the inferior vena cava that directs the blood through the foramen ovale to the left atrium in the fetus but is rudimentary and functionless in the adult
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“Eustachian valve.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/eustachian%20valve. Accessed 29 Sep. 2023.
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