1. (noun)
accessory hemiazygos vein, accessory hemiazygous vein, vena hemiazygos accessoria
- a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein Synonyms: accessory hemiazygous vein, accessory hemiazygos vein, vena hemiazygos accessoria