pulmonary arch
noun
: either the right or the left sixth aortic arch that in the human fetus persists on the right side as the right pulmonary artery and on the left side as the ductus arteriosus and part of the pulmonary trunk
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“Pulmonary arch.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/pulmonary%20arch. Accessed 5 Dec. 2023.
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