Dictionary

microorganism

microorganism

noun mi·cro·or·gan·ism \-ˈr-gə-ˌni-zəm\

biology : an extremely small living thing that can only be seen with a microscope

Full Definition of MICROORGANISM

:  an organism (as a bacterium or protozoan) of microscopic or ultramicroscopic size

Origin of MICROORGANISM

International Scientific Vocabulary
First Known Use: 1880

microorganism

noun mi·cro·or·gan·ism \-ˈr-gə-ˌniz-əm\   (Medical Dictionary)

Medical Definition of MICROORGANISM

:  an organism of microscopic or ultramicroscopic size

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