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We found 73 dictionaries with English definitions that include the word radiation:
Click on the first link on a line below to go directly to a page where "radiation" is defined.

General (30 matching dictionaries)

1. radiation: Merriam-Webster.com [home, info]
2. radiation: Oxford Learner's Dictionaries [home, info]
3. radiation: American Heritage Dictionary of the English Language [home, info]
4. radiation: Collins English Dictionary [home, info]
5. radiation: Vocabulary.com [home, info]
6. radiation: Macmillan Dictionary [home, info]
7. Radiation, radiation: Wordnik [home, info]
8. radiation: Cambridge Advanced Learner's Dictionary [home, info]
9. radiation: Wiktionary [home, info]
10. radiation: Webster's New World College Dictionary, 4th Ed. [home, info]
11. radiation: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. radiation: Infoplease Dictionary [home, info]
13. radiation: Dictionary.com [home, info]
14. radiation: Online Etymology Dictionary [home, info]
15. radiation: UltraLingua English Dictionary [home, info]
16. radiation: Cambridge Dictionary of American English [home, info]
17. Radiation (EP), Radiation (Marillion album), Radiation (album), Radiation (biology), Radiation (disambiguation), Radiation (evolution), Radiation (medicine), Radiation (pain), Radiation: Wikipedia, the Free Encyclopedia [home, info]
18. Radiation: Online Plain Text English Dictionary [home, info]
19. radiation: Webster's Revised Unabridged, 1913 Edition [home, info]
20. radiation: Rhymezone [home, info]
21. radiation: AllWords.com Multi-Lingual Dictionary [home, info]
22. radiation: Webster's 1828 Dictionary [home, info]
23. Radiation: Encarta® Online Encyclopedia, North American Edition [home, info]
24. radiation: Free Dictionary [home, info]
25. radiation: Mnemonic Dictionary [home, info]
26. radiation: WordNet 1.7 Vocabulary Helper [home, info]
27. radiation: LookWAYup Translating Dictionary/Thesaurus [home, info]
28. radiation: Dictionary/thesaurus [home, info]

Business (2 matching dictionaries)

29. Radiation: Energy Dictionary [home, info]
30. radiation: BusinessDictionary.com [home, info]

Computing (2 matching dictionaries)

31. Radiation: Cybernetics and Systems [home, info]
32. radiation: Encyclopedia [home, info]

Medicine (10 matching dictionaries)

33. Radiation: MedTerms.com Medical Dictionary [home, info]
34. Radiation: Medical Dictionary [home, info]
35. Radiation: Merck Manuals [home, info]
36. radiation: online medical dictionary [home, info]
37. radiation: Prostate Cancer Interactive Glossary [home, info]
38. radiation: Dictionary of Cancer Terms [home, info]
39. radiation: Parents' Common Sense Encyclopedia [home, info]
40. radiation: Medical dictionary [home, info]
41. Radiation: Drug Medical Dictionary [home, info]
42. radiation: Hyperdictionary [home, info]

Miscellaneous (1 matching dictionary)

43. radiation: Encyclopedia of Graphic Symbols [home, info]

Science (14 matching dictionaries)

44. Radiation: From Stargazers to Starships Glossary [home, info]
45. Radiation: Solar Radiation Resource Terms [home, info]
46. radiation: Environmental Terminology Discovery Service [home, info]
47. Radiation: Eric Weisstein's World of Physics [home, info]
48. radiation: Imagine the Universe! Dictionary [home, info]
49. radiation: On-Line Biology Book: GLOSSARY [home, info]
50. Radiation: Extragalactic Astronomy [home, info]
51. Radiation: Fishkeeping glossary [home, info]
52. radiation: UNCChem Glossary [home, info]
53. Radiation: Accelerator Glossary [home, info]
54. radiation: Natural History Terms [home, info]
55. Radiation: Geography Dictionary [home, info]
56. RADIATION: Weather Glossary [home, info]

Slang (1 matching dictionary)

58. radiation: Urban Dictionary [home, info]

Tech (13 matching dictionaries)

59. radiation: Webster's New World Telecom Dictionary [home, info]
60. radiation: High-Energy Astrophysics [home, info]
61. Radiation: AUTOMOTIVE TERMS [home, info]
62. Radiation: Efficient Windows [home, info]
63. RADIATION: Energy Terms [home, info]
64. radiation: Glossary of Meteorology [home, info]
65. RADIATION: Glossary of Common Hearth and Heating Terms [home, info]
66. Radiation: Explosives [home, info]
67. Radiation: Construction Glossary [home, info]
68. Radiation: National Weather Service Glossary [home, info]
69. Radiation: Glossary of Energy Terms [home, info]
70. RADIATION: Power Engineering [home, info]
71. Radiation: Nuclear Terms [home, info]

(Note: See radiative for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (radiation) ▸ noun:  the act of spreading outward from a central source ▸ noun:  a radial arrangement of nerve fibers connecting different parts of the brain ▸ noun:  the spread of a group of organisms into new habitats ▸ noun:  energy that is radiated or transmitted in the form of rays or waves or particles ▸ noun:  the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay ▸ noun:  (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance ▸ noun:  syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours ("He was suffering from radiation") ▸ Also see radiative ▸ Word origin ▸ Words similar to radiation ▸ Usage examples for radiation ▸ Idioms related to radiation (New!) ▸ Popular adjectives describing radiation ▸ Words that often appear near radiation ▸ Rhymes of radiation ▸ Invented words related to radiation