You know what it looks like… but what is it called?
TAKE THE QUIZ“venosus”
We have one entry that includes the term venosus.
sinus venosus
noun: an enlarged pouch that adjoins the heart, is formed by the union of the large systemic veins, and is the passage through which venous blood enters the heart in lower vertebrates and in embryos of higher forms
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Merriam-Webster unabridged