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We found 44 dictionaries with English definitions that include the word radioactive:
Click on the first link on a line below to go directly to a page where "radioactive" is defined.

General (27 matching dictionaries)

1. radioactive: Merriam-Webster.com [home, info]
2. radioactive: Oxford Learner's Dictionaries [home, info]
3. radioactive: American Heritage Dictionary of the English Language [home, info]
4. radioactive: Collins English Dictionary [home, info]
5. radioactive: Vocabulary.com [home, info]
6. radioactive: Macmillan Dictionary [home, info]
7. Radioactive, radioactive: Wordnik [home, info]
8. radioactive: Cambridge Advanced Learner's Dictionary [home, info]
9. radioactive: Wiktionary [home, info]
10. radioactive: Webster's New World College Dictionary, 4th Ed. [home, info]
11. radioactive: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. radioactive: Infoplease Dictionary [home, info]
13. radioactive: Dictionary.com [home, info]
14. radioactive: Online Etymology Dictionary [home, info]
15. radioactive: UltraLingua English Dictionary [home, info]
16. radioactive: Cambridge Dictionary of American English [home, info]
17. Radioactive (Gene Simmons song), Radioactive (Imagine Dragons song), Radioactive (Kings of Leon song), Radioactive (Rita Ora song), Radioactive (The Firm song), Radioactive (Yelawolf album), Radioactive (disambiguation), Radioactive (film), Radioactive: Wikipedia, the Free Encyclopedia [home, info]
18. radioactive: Rhymezone [home, info]
19. radioactive: AllWords.com Multi-Lingual Dictionary [home, info]
20. radioactive: Free Dictionary [home, info]
21. radioactive: The Phrontistery - A Dictionary of Obscure Words [home, info]
22. radioactive: Mnemonic Dictionary [home, info]
23. radioactive: WordNet 1.7 Vocabulary Helper [home, info]
24. radioactive: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. radioactive: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

26. radioactive: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

27. radioactive: Encyclopedia [home, info]

Medicine (8 matching dictionaries)

28. Radioactive: MedTerms.com Medical Dictionary [home, info]
29. radioactive: Breast Cancer Talking Dictionary [home, info]
30. radioactive: online medical dictionary [home, info]
31. radioactive: Prostate Cancer Interactive Glossary [home, info]
32. radioactive: Dictionary of Cancer Terms [home, info]
33. radioactive: Medical dictionary [home, info]
34. Radioactive: Drug Medical Dictionary [home, info]
35. radioactive: Hyperdictionary [home, info]

Science (4 matching dictionaries)

36. Radioactive: Misunderstood Physics Terms [home, info]
37. Radioactive: Eric Weisstein's World of Physics [home, info]
38. Radioactive: Physic and Astronomy Glossary [home, info]
39. radioactive: UNCChem Glossary [home, info]

Slang (1 matching dictionary)

40. radioactive: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

41. radioactive: NATURAL RESOURCES DEFENSE COUNCIL [home, info]
42. Radioactive: Gems and Precious Stones [home, info]

(Note: See radioactives for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (radioactive) ▸ adjective:  exhibiting or caused by radioactivity ("Radioactive isotope") ▸ Also see radioactives ▸ Word origin ▸ Words similar to radioactive ▸ Usage examples for radioactive ▸ Idioms related to radioactive (New!) ▸ Popular nouns described by radioactive ▸ Words that often appear near radioactive ▸ Rhymes of radioactive ▸ Invented words related to radioactive