Usually means: Water molecule consisting of hydrogen, oxygen.
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We found 18 dictionaries that define the word H2O:

General (13 matching dictionaries)
  1. H2O: Merriam-Webster
  2. H2O: Vocabulary.com
  3. h2o: Wordnik
  4. H2O, h2o: Dictionary.com
  5. H2O (American band), H2O (Hall & Oates album), H2O (Puerto Rican band), H2O (Scottish band), H2O (band), H2O (disambiguation), H2O (miniseries), H2O, H2o: Wikipedia, the Free Encyclopedia
  6. H2o: Rhymezone
  7. h2o: FreeDictionary.org
  8. h2o: Mnemonic Dictionary
  9. H2O: TheFreeDictionary.com
  10. h2o: Longman Dictionary of Contemporary English
  11. H2O: Merriam-Webster

Computing (1 matching dictionary)
  1. H2O: Encyclopedia

Medicine (1 matching dictionary)
  1. University of Maryland Glossary of Medical Terms (No longer online)

Miscellaneous (2 matching dictionaries)
  1. H2O: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (1 matching dictionary)
  1. H2O, The H2O: Urban Dictionary

Definitions from WordNet (
)
American English Definition British English Definition
noun:  binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent


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