Usually means: Tiny organisms, often single-celled.
Definitions Related words Mentions
We found 11 dictionaries that define the word micro-organism:

General (8 matching dictionaries)
  1. micro-organism: Vocabulary.com
  2. micro-organism: Wordnik
  3. micro-organism: Wiktionary
  4. micro-organism: Dictionary.com
  5. Micro-organism: Wikipedia, the Free Encyclopedia
  6. micro-organism: FreeDictionary.org
  7. micro-organism: Mnemonic Dictionary
  8. micro-organism: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Micro-organism: Encyclopedia

Medicine (1 matching dictionary)
  1. Micro-organism: Medical dictionary

Science (1 matching dictionary)
  1. Fishkeeping glossary (No longer online)

Definitions from Wiktionary (Micro-organism)

noun:  Alternative spelling of microorganism [(microbiology) An organism that is too small to be seen by the unaided eye; especially, a single-celled organism, such as a bacterium.]

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