from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small loudspeaker designed to reproduce high-pitched sounds in a high-fidelity audio system.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An electronic speaker designed to produce high-frequency sound.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a loudspeaker that reproduces higher audio frequency sounds
From to tweet + -er. (Wiktionary)