Dictionary

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 Defined for Kids

microorganism

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

Definition of MICROORGANISM for Kids

:  a living thing (as a bacterium) that can only be seen with a microscope
Medical Dictionary

microorganism

noun mi·cro·or·gan·ism \-ˈr-gə-ˌniz-əm\

Medical Definition of MICROORGANISM

:  an organism of microscopic or ultramicroscopic size

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