hemiazygos vein

noun

hemi·​a·​zy·​gos vein -(ˈ)ā-ˈzī-gəs-  -ˈaz-ə-gəs- 

variants also hemiazygous 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