from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A subdivision of a larger unit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any subdivision of a larger unit
- n. A protein subunit
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a monetary unit that is valued at a fraction (usually one hundredth) of the basic monetary unit
sub- + unit (Wiktionary)