microorganism

/ˌmaɪ.kɹəʊˈɔː.ɡən.ɪ.zəm̩/

IPA: /M AY0 K R OW0 AO1 R G AH0 N IH0 Z AH0 M/

noun

1
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 and further digested by specialized microorganisms that live in the rumen.”

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