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We found 49 dictionaries with English definitions that include the word radioactivity:
Click on the first link on a line below to go directly to a page where "radioactivity" is defined.

General dictionaries General (26 matching dictionaries)
  1. radioactivity: Merriam-Webster.com [home, info]
  2. radioactivity: Oxford Learner's Dictionaries [home, info]
  3. radioactivity: American Heritage Dictionary of the English Language [home, info]
  4. radioactivity: Collins English Dictionary [home, info]
  5. radioactivity: Vocabulary.com [home, info]
  6. radioactivity: Macmillan Dictionary [home, info]
  7. Radioactivity, radioactivity: Wordnik [home, info]
  8. radioactivity: Cambridge Advanced Learner's Dictionary [home, info]
  9. radioactivity: Wiktionary [home, info]
  10. radioactivity: The Wordsmyth English Dictionary-Thesaurus [home, info]
  11. radioactivity: Infoplease Dictionary [home, info]
  12. radioactivity: Dictionary.com [home, info]
  13. radioactivity: UltraLingua English Dictionary [home, info]
  14. radioactivity: Cambridge Dictionary of American English [home, info]
  15. Radioactivity (album), Radioactivity (disambiguation), Radioactivity (song), Radioactivity: Wikipedia, the Free Encyclopedia [home, info]
  16. radioactivity: Rhymezone [home, info]
  17. radioactivity: AllWords.com Multi-Lingual Dictionary [home, info]
  18. Radioactivity: Encarta® Online Encyclopedia, North American Edition [home, info]
  19. Radioactivity: 1911 edition of the Encyclopedia Britannica [home, info]
  20. radioactivity: Free Dictionary [home, info]
  21. radioactivity: Mnemonic Dictionary [home, info]
  22. radioactivity: WordNet 1.7 Vocabulary Helper [home, info]
  23. radioactivity: LookWAYup Translating Dictionary/Thesaurus [home, info]
  24. radioactivity: Dictionary/thesaurus [home, info]

Business dictionaries Business (1 matching dictionary)
  1. Radioactivity: Energy Dictionary [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. radioactivity: Encyclopedia [home, info]

Medicine dictionaries Medicine (2 matching dictionaries)
  1. radioactivity: online medical dictionary [home, info]
  2. radioactivity: Medical dictionary [home, info]

Miscellaneous dictionaries Miscellaneous (2 matching dictionaries)
  1. radioactivity: Encyclopedia of Graphic Symbols [home, info]
  2. Radioactivity: Army Technology Glossary [home, info]

Science dictionaries Science (11 matching dictionaries)
  1. Radioactivity: Misunderstood Physics Terms [home, info]
  2. Radioactivity: From Stargazers to Starships Glossary [home, info]
  3. Radioactivity: Chemistry Dictionary [home, info]
  4. Radioactivity: Eric Weisstein's World of Physics [home, info]
  5. Radioactivity: Extragalactic Astronomy [home, info]
  6. radioactivity: General Chemistry Online [home, info]
  7. radioactivity: Evolution Glossary [home, info]
  8. Radioactivity: Physic and Astronomy Glossary [home, info]
  9. Radioactivity: NRC Glossary of Nuclear Terms -- [home, info]
  10. Radioactivity: Accelerator Glossary [home, info]
  11. Slang (1 matching dictionary)
    1. radioactivity: Urban Dictionary [home, info]

    Tech dictionaries Tech (5 matching dictionaries)
    1. radioactivity: NATURAL RESOURCES DEFENSE COUNCIL [home, info]
    2. radioactivity: DOD Dictionary of Military Terms [home, info]
    3. radioactivity: Glossary of Meteorology [home, info]
    4. Radioactivity: Nuclear Terms [home, info]
    5. Radioactivity: Explosives [home, info]

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (radioactivity)

noun:  the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

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Phrases that include radioactivity:   induced radioactivity, radioactivity radiation, journal of environmental radioactivity, proton radioactivity, radioactivity in the life sciences, more...

Words similar to radioactivity:   activity, more...

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