1. any unpaired part, as the azygos vein.
2. unpaired. Called also azygous.
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In anatomy, azygos, from the Greek άζυξ, refers to a structure that is unpaired. This is relatively unusual, as most elements of anatomy reflect bilateral symmetry. Another term for the same concept is impar.
Well-known structures incorporating this nomenclature include the azygos vein, ganglion impar, and the anatomical variant known as the azygos lobe of the lung.
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