a. (and sb.) Phys. [(a. or) f. Gr. ἀζυγος unyoked, not a pair, f. ἀ priv. + ζυγόν yoke: see -OUS. Cf. mod.F. azygos.] A. adj. Fellowless, unpaired: a technical epithet of organic parts not existing in pairs. B. sb. An organic part of this description.
1646. Sir T. Browne, Pseud. Ep., 183. The Azygos, or vena sine pari.
1681. trans. Willis’ Rem. Med. Wks. Azygos vein, is a branch of the upper trunk of the vena cava, arising on the right side.
1859. Todd, Cycl. Anat. & Phys., V. 81/1. The pancreas is an azygous, non-symmetrical, glandular organ.
1870. Rolleston, Anim. Life, Introd. 38. An azygos orifice in the abdominal walls.
