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The following 2 entries include the term hemiazygos.
accessory hemiazygos vein
noun: a vein that drains the upper left side of the thoracic wall, descends along the left side of the spinal column, and empties into the azygos or hemiazygos veins near the middle of the thorax
hemiazygos vein
noun: a vein that receives blood from the lower half of the left thoracic wall and the left abdominal wall, ascends along the left side of the spinal column, and empties into the azygos vein near the middle of the thorax
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Merriam-Webster unabridged
