Dictionary > Microorganism

Microorganism

Definition
noun, plural: microorganisms
An organism that is microscopic or submicroscopic, which means it is too small to be seen by the unaided human eye.
Supplement
Microorganisms were first observed by Anton van Leeuwenhoek in 1675 using a microscope of his own design.
Examples of microorganisms include bacteria, fungi, archaea, and protists. Viruses and prions, although microscopic, are not considered microorganisms by others because they are generally regarded as non-living.
Word origin: Gk: comb. form repr. mīkrós small + organism > organ: Gk órganon implement, tool, bodily organ.
Related forms: microorganic, microoganismal (adjective).
Compare: macroorganism.

See also: organism, microbiology.


You will also like...

Sugar Homeostasis
Sugar Homeostasis

The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

3D rendering of an antibody
Passive and Active Types of Immunity

Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..

Homeostatic Mechanisms and Cellular Communication
Homeostatic Mechanisms and Cellular Communication

Homeostasis is the relatively stable conditions of the internal environment that result from compensatory regulatory res..

Lentic community
Freshwater Communities & Lentic Waters

Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

A chart depicting Mendel's Law of Dominance
Mendel’s Law & Mendelian Genetics

One of Mendel’s law of inheritance is the “law of dominance”. Read this tutorial to know more about this form of i..

Community Patterns

Learn about community patterns and the ecological factors influencing these patterns. Revisit some of the ecosystems you..