Medical Definition of azygos vein
: any of a system of three veins which drain the thoracic wall and much of the abdominal wall and which form a collateral circulation when either the inferior or superior vena cava is obstructed especially : a vein that receives blood from the right half of the thoracic and abdominal walls, ascends along the right side of the spinal column, and empties into the superior vena cava — compare accessory hemiazygos vein, hemiazygos vein
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