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azygos az·y·gos (āz’ĭ-gŏs’, ā-zī’gŏs’)
An unpaired anatomical structure. adj. or a·zy·gous (ā-zī’gəs)
Not one of a pair, as a vein or muscle; occurring singly.
Historical Examples

This discovery of a tuberculosis of the blood-vessels was confirmed by Klebs, who had found a tuberculosis of the azygos veins.
A System of Practical Medicine by American Authors, Vol. I Various

The vertebral and segmental venous system, representing the azygos veins of the mammalia, is very rudimentary (Figs. 266 and 267).
The Anatomy of the Human Peritoneum and Abdominal Cavity George. S. Huntington

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

In Halmaturus bennettii there are two azygos veins, one left and one right, of which the left is rather the larger.
The Cambridge Natural History, Vol X., Mammalia Frank Evers Beddard


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