View Microorganisms Definition Biology Background. Microorganism definition, any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae. The examination of microorganisms is known as.
An extremely small living thing. Microorganism in the largest biology dictionary online. A microorganism may exist either in single celled form or in a colony of cells.
The field is concerned with the structure, function, and.
Most microbes, such as bacteria and archaea, consist of only a single cell. Microorganisms are microscopic organisms that include bacteria, archaea, and protist (protozoa, protophyta, and mold). Microorganisms differ from each other not only in size, but also in structure, habitat, metabolism, and many other characteristics. British dictionary definitions for microorganism.