Usually means: Radioactive gas from natural decay.
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We found 47 dictionaries that define the word radon:

General (21 matching dictionaries)
  1. radon: Longman Dictionary of Contemporary English
  2. radon: Merriam-Webster
  3. radon: Oxford Learner's Dictionaries
  4. radon: American Heritage Dictionary of the English Language
  5. radon: Collins English Dictionary
  6. radon: Vocabulary.com
  7. Radon, radon: Wordnik
  8. radon: Cambridge Advanced Learner's Dictionary
  9. radon: Wiktionary
  10. radon: Webster's New World College Dictionary, 4th Ed.
  11. radon: The Wordsmyth English Dictionary-Thesaurus
  12. radon: Infoplease Dictionary
  13. radon: Dictionary.com
  14. radon: Online Etymology Dictionary
  15. Radon (disambiguation), Radon: Wikipedia, the Free Encyclopedia
  16. radon: Rhymezone
  17. radon: FreeDictionary.org
  18. radon: Mnemonic Dictionary
  19. radon: TheFreeDictionary.com

Business (3 matching dictionaries)
  1. radon: Legal dictionary
  2. Radon (Rn), Radon (element), radon: Financial dictionary
  3. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. Radon (Rn), Radon (element), radon: Encyclopedia

Medicine (10 matching dictionaries)
  1. radon: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Radon: MedTerms.com Medical Dictionary
  4. Medical Dictionary (No longer online)
  5. Radon: Merck Manuals
  6. online medical dictionary (No longer online)
  7. radon: Dictionary of Cancer Terms
  8. Radon (Rn), Radon (element), radon: Medical dictionary
  9. Radon: Drug Medical Dictionary
  10. Hyperdictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. RADON: Acronym Finder

Science (2 matching dictionaries)
  1. Radon (Rn): NRC Glossary of Nuclear Terms --
  2. Radon, radon, radon (emanio): WebElements Periodic Table of the Elements

Slang (1 matching dictionary)
  1. radon: Urban Dictionary

Tech (8 matching dictionaries)
  1. Radon: Glossary of Air Pollution Terms
  2. AUTOMOTIVE TERMS (No longer online)
  3. Glossary of Meteorology (No longer online)
  4. Explosives (No longer online)
  5. Lake and Water Word Glossary (No longer online)
  6. Radon: Construction Glossary
  7. Glossary of Energy Terms (No longer online)
  8. Nuclear Terms (No longer online)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
noun:  Radon-222 (²²²₈₆Rn), the most stable isotope of said element.
noun:  A surname from German.

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