Meaning of “microorganism” in the English Dictionary

american-english dictionary

"microorganism" in British English

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microorganismnoun [ C ]

uk /ˌmaɪ.krəʊˈɔː.ɡən.ɪ.zəm/ us /ˌmaɪ.kroʊˈɔːr.ɡən.ɪ.zəm/


  • Inside each tubeworm, there is a colony of these microorganisms.
  • Many microorganisms live inside a tubeworm.
  • Microorganisms near the vents take in the chemicals and change them to energy.
  • The scientist was doing research on microorganisms.
  • The tubeworms use the energy produced by the microorganisms as food.
  • There are many questions about how the microorganisms got so high above the Earth, but one thing is certain: Life can make its home almost anywhere.
  • When they studied the air, they found microorganisms living there, including three new kinds, or species, never seen before.

(Definition of “microorganism” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"microorganism" in American English

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microorganismnoun [ C ]

us /ˌmɑɪ·kroʊˈɔr·ɡəˌnɪz·əm/

biology a living thing which on its own is too small to be seen without a microscope (= device that makes small objects look larger)

(Definition of “microorganism” from the Cambridge Academic Content Dictionary © Cambridge University Press)