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mi·cro·or·gan·ism

microorganism

 
pronunciation:
maI kro or g nih zm
features:
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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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  bacteria, ecosystem, ocean, virus
Word Parts  About this feature
The word microorganism contains the following part:
micro- Greek prefix that means small
synonyms:
min
antonyms:
magn, magna, magni, maxi, mega, megal, megalo, -megaly, macro-