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A minute life form; a microorganism, especially a bacterium that causes disease. Not in technical use.
mi·cro′bi·al (mī-krō′bē-əl), mi·cro′bic (-krō′bĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.