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.
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
azygos azygos az·y·gos (āz’ĭ-gŏs’, ā-zī’gŏs’) n. 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 […]
a reproductive cell formed without the fusion of gametes, as in certain algae and fungi. noun a thick-walled spore produced by parthenogenesis in certain algae and fungi Also called parthenospore
not being one of a pair; single. Historical Examples The last joint in the abdomen of Crustacea; variously regarded as a segment without appendages, or as an azygous appendage. The Ancient Life History of the Earth Henry Alleyne Nicholson adjective (biology) developing or occurring singly
unleavened bread used in a Eucharistic service.