from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The part of an animal's skin that it cannot reach to scratch itself - usually the space between the shoulder blades.
from The Century Dictionary and Cyclopedia
- n. That part of the spine in quadrupeds which extends from between the shoulder-blades to the loins, and which the animal cannot reach to scratch.
From ἄκνηστις (aknēstis, "spine"), from the Ancient Greek word knestis ("spine, cheese-grater"). (Wiktionary)