truncus arteriosus
noun
truncus ar·te·ri·o·sus
-är-ˌtir-ē-ˈō-səs 
: the part of the embryonic arterial system which develops into the ascending aorta and the pulmonary trunk
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“Truncus arteriosus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/truncus%20arteriosus. Accessed 25 Dec. 2024.
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