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Definition of microorganism

microorganism

/ˌmaɪkroʊˈɔːrɡənɪzəm/
mi · cro · or · gan · ism
Plural:microorganisms
•
Adjective:microorganic
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microorganism Lexical Profile

microorganism Game Scores & Validity

• noun

1

A microscopic living organism, such as a bacterium, archaeon, protozoan, unicellular alga, or fungus, often including viruses in general scientific usage.

Example

"Soil is teeming with billions of beneficial microorganisms that break down organic matter and recycle nutrients for plants."

Synonyms
View all synonyms for microorganism
Antonyms
View all antonyms for microorganism

• Rhymes for microorganism

• Nearby Words

micronesia
micronesian
micronutrient
microorganism
micropayment
microphone
micropig

Word Origin & Etymology

Coined in the late 19th century from the combining form 'micro-' (from Ancient Greek 'mikros', meaning 'small') and 'organism', following the rise of germ theory and modern microbiology.

Cite this Entry

Wordmom. (2026). Definition of Microorganism. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/microorganism
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