Definition, Meaning & Synonyms

microorganism

Noun

ˌmaɪkroʊˈɔrgənɪzəm

Definition

A microorganism is a tiny living organism that can only be seen under a microscope.

Examples

Bacteria are a common type of microorganism found in soil.
Viruses, though not considered living organisms, are also classified as microorganisms.
Fungi, such as yeast, are important microorganisms used in baking and brewing.

Meaning

Microorganisms are a diverse group of very small organisms that include bacteria, viruses, fungi, and protozoa. They are essential for many processes in nature, including decomposition and nutrient cycling.