sinus venosus

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sinus ve·no·sus

 (vē-nō′səs)
n.
The first chamber in the heart of fish, amphibians, reptiles, and the embryos of birds and mammals, which receives blood from the veins and contracts to force the blood into the atrium.

[New Latin sinus vēnōsus : Medieval Latin sinus, sinus + Latin vēnōsus, venous.]