Usually means: Ancient microorganism, distinct from bacteria.
Definitions Related words Phrases Mentions History
We found 22 dictionaries that define the word Archaean:

General (19 matching dictionaries)
  1. Archaean, archaean: Merriam-Webster
  2. archaean: Collins English Dictionary
  3. archaean: Vocabulary.com
  4. Archaean: Wordnik
  5. Archaean, archaean: Wiktionary
  6. Archaean: Webster's New World College Dictionary, 4th Ed.
  7. Archaean: Infoplease Dictionary
  8. Archaean: Dictionary.com
  9. Archaean: Online Etymology Dictionary
  10. Archaean: Wikipedia, the Free Encyclopedia
  11. Archaean: Online Plain Text English Dictionary
  12. archaean: Rhymezone
  13. Archaean: AllWords.com Multi-Lingual Dictionary
  14. archaean: FreeDictionary.org
  15. archaean: Mnemonic Dictionary
  16. Archaean: TheFreeDictionary.com
  17. Archaean: American Heritage Dictionary of the English Language
  18. Archaean, archaean: Oxford Learner's Dictionaries
  19. Archaean: Merriam-Webster

Computing (1 matching dictionary)
  1. Archaean, archaean: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (1 matching dictionary)
  1. Archaean: USGS Paleontology Glossary of Terms

(Note: See archaeans as well.)

Definitions from Wiktionary (Archaean)

adjective:  (mythology) Of or relating to Arche, the Muse of beginnings in Greek mythology.
adjective:  (geology) Of, or relating to the geologic eon from about 4,031 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life.
adjective:  (astronomy, "Archean" only) Of or relating to the irregular Jovian moon named for Arche.
noun:  (geology) The eon from 2,500 Ma to 4,000 Ma.
noun:  (biology) Any organism of the domain Archaea.

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