archaeon

/ɑrˈkiːɑn/
noun
  1. A single-celled microorganism that lives in extreme environments, such as hot springs or salt lakes, and is different from bacteria and other life forms.
    • This archaeon produces a special enzyme used in some industrial processes.
    • An archaeon can survive in boiling water that would kill most other organisms.
    • Scientists discovered a new archaeon living in a deep-sea volcanic vent.
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