hemiazygos vein

noun
hemi·a·zy·gos vein | \-(ˈ)ā-ˈzī-gəs-, -ˈaz-ə-gəs- \
variants: also hemiazygous vein

Medical Definition of hemiazygos vein 

: 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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