sinus terminalis
noun
sinus ter·mi·na·lis
-ˌtər-mi-ˈnā-ləs 
: a circular blood sinus bordering the area vasculosa of the vertebrate embryo
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“Sinus terminalis.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/sinus%20terminalis. Accessed 27 Apr. 2024.
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