# microorganism

> English word · Noun · IPA /ˌmaɪ.kɹəʊˈɔː.ɡəˌnɪz.m̩/ · frequency rank #65,307

## Definitions
1. An organism that is too small to be seen by the unaided eye; especially, a single-celled organism, such as a bacterium.

## Etymology
From micro- + organism.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/microorganism