from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A minute life form; a microorganism, especially a bacterium that causes disease. Not in technical use.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any microorganism, but specially said of those microorganisms which are harmful types of bacteria.
from the GNU version of the Collaborative International Dictionary of English
- n. A microscopic organism; a microorganism; -- particularly applied to bacteria and especially to pathogenic forms.
from The Century Dictionary and Cyclopedia
- n. A minute living being not distinguished, primarily, as to its animal or vegetable nature.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a minute life form (especially a disease-causing bacterium); the term is not in technical use
French : Greek mīkro-, micro- + Greek bios, life; see gwei- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek μικρός (mikros, "small") and βίος (bios, "life"). (Wiktionary)