Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[New Latin sinus vēnōsus : Medieval Latin sinus, sinus + Latin vēnōsus, venous.]
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