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microorganism

mi·cro·or·gan·ism

microorganism

 
pronunciation:
maI kro or g nih zm
features:
Word Explorer, Word Parts
part of speech: noun
definition: any life form so small that it can only be seen with a microscope. Microorganisms include bacteria, viruses, and many protozoans.
similar words:
germ, microbe
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See
  bacteria, ecosystem, ocean, virus