from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In anatomy, a structure that is unpaired. This is relatively unusual, as most elements of anatomy reflect bilateral symmetry.
from The Century Dictionary and Cyclopedia
- n. An azygous part, as a muscle, vein, etc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. occurring singly; not one of a pair
From the Ancient Greek άνισος. (Wiktionary)