microorganism.
An organism that is too small to be seen by the unaided eye; especially, a single-celled organism, such as a bacterium.
Meaning & usage
An organism that is too small to be seen by the unaided eye; especially, a single-celled organism, such as a bacterium.
The cud is then reswallowed by the ruminant and further digested by specialized microorganisms that live in the rumen.
Where this word comes from
Etymology tree English micro- Proto-Indo-European *werǵ-der. Ancient Greek ὄργανον (órganon)bor. Latin organumder. Old French organebor. Middle English organe English organ Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íd͏̌d͏̌ō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (-ismós)der. English -ism English organism English microorganism From micro- + organism.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.