azygos noun & adjective. ['azɪgǝs] As adjective also azygous. M17.
[from Greek azugos, from A-¹⁰ + zugon yoke: see -OUS.]
Chiefly Anatomy. (An organic part, esp. a vein) that is not one of a pair.
azygos vein a large vein of the right posterior thorax, draining into the superior vena cava.

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