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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 (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 (1 matching dictionary)

25. Radioactivity: Energy Dictionary [home, info]

Computing (1 matching dictionary)

26. radioactivity: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

27. radioactivity: online medical dictionary [home, info]
28. radioactivity: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

29. radioactivity: Encyclopedia of Graphic Symbols [home, info]
30. Radioactivity: Army Technology Glossary [home, info]

Science (11 matching dictionaries)

31. Radioactivity: Misunderstood Physics Terms [home, info]
32. Radioactivity: From Stargazers to Starships Glossary [home, info]
33. Radioactivity: Chemistry Dictionary [home, info]
34. Radioactivity: Eric Weisstein's World of Physics [home, info]
35. Radioactivity: Extragalactic Astronomy [home, info]
36. radioactivity: General Chemistry Online [home, info]
37. radioactivity: Evolution Glossary [home, info]
38. Radioactivity: Physic and Astronomy Glossary [home, info]
39. Radioactivity: NRC Glossary of Nuclear Terms -- [home, info]
40. Radioactivity: Accelerator Glossary [home, info]
41. Slang (1 matching dictionary)
    
    42. radioactivity: Urban Dictionary [home, info]
    
    Tech (5 matching dictionaries)
    
    43. radioactivity: NATURAL RESOURCES DEFENSE COUNCIL [home, info]
    44. radioactivity: DOD Dictionary of Military Terms [home, info]
    45. radioactivity: Glossary of Meteorology [home, info]
    46. Radioactivity: Nuclear Terms [home, info]
    47. Radioactivity: Explosives [home, info]
    
    

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (radioactivity) ▸ noun:  the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay ▸ Words similar to radioactivity ▸ Usage examples for radioactivity ▸ Idioms related to radioactivity (New!) ▸ Popular adjectives describing radioactivity ▸ Words that often appear near radioactivity ▸ Rhymes of radioactivity ▸ Invented words related to radioactivity