from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hollow-body guitar of the older variety, in contradistinction to an electric guitar.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. sound is not amplified by electrical means
Retronym for guitar, coined after the invention of the electric guitar to refer to the older type of guitar and avoid confusion with the electric guitar. (Wiktionary)