Azygos vein



azygos vein

azygos vein n.
A vein that arises from the right ascending lumbar vein or the inferior vena cava, ascends through the aortic orifice of the diaphragm, lies in the posterior mediastinum, and terminates in the superior vena cava.
Historical Examples

The Edentates, at any rate the American forms, have a double vena cava posterior and no azygos vein.
The Cambridge Natural History, Vol X., Mammalia Frank Evers Beddard

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