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(Anatomy) the superior vena cava, the vein which carries blood from the head, chest and arms back to the heart; more generally, any cranial vena cava
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|Noun||1.||precava - receives blood from the head and arms and chest and empties into the right atrium of the heart; formed from the azygos and both brachiocephalic veins|
vena cava - either of two large veins that return oxygen-depleted blood to the right atrium of the heart