Microorganism

//ˌmaɪ.kɹəʊˈɔː.ɡəˌnɪz.m̩// noun

Definitions

Noun
  1. 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."

  2. 2
    any organism of microscopic size wordnet

Etymology

From micro- + organism.

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