Confused and have questions? We’ve got answers. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors.

Microorganism

From Biology-Online Dictionary | Biology-Online Dictionary
Jump to: navigation, search

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.