microorganism

microorganism definition - medical

mi·cro·or·gan·ism (mīˌkrō-ôrˈgə-nĭzˌəm)

noun
An organism of microscopic or submicroscopic size, especially a bacterium or protozoan.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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