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We found 59 dictionaries with English definitions that include the word radical:
Click on the first link on a line below to go directly to a page where "radical" is defined.

General (33 matching dictionaries)

1. radical: Merriam-Webster.com [home, info]
2. radical: Oxford Learner's Dictionaries [home, info]
3. radical: American Heritage Dictionary of the English Language [home, info]
4. radical: Collins English Dictionary [home, info]
5. radical: Vocabulary.com [home, info]
6. radical, radical: Macmillan Dictionary [home, info]
7. Radical, radical: Wordnik [home, info]
8. radical: Cambridge Advanced Learner's Dictionary [home, info]
9. radical: Wiktionary [home, info]
10. radical: Webster's New World College Dictionary, 4th Ed. [home, info]
11. radical: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. radical: Infoplease Dictionary [home, info]
13. radical: Dictionary.com [home, info]
14. radical: Online Etymology Dictionary [home, info]
15. radical: UltraLingua English Dictionary [home, info]
16. radical: Cambridge Dictionary of American English [home, info]
17. Radical (Chinese), Radical (Chinese character), Radical (Chinese characters), Radical (Smack album), Radical (album), Radical (book), Radical (chemistry), Radical (mixtape), Radical: Wikipedia, the Free Encyclopedia [home, info]
18. Radical: Online Plain Text English Dictionary [home, info]
19. radical: Webster's Revised Unabridged, 1913 Edition [home, info]
20. radical: Rhymezone [home, info]
21. radical, radical, radical(e) (-aux): AllWords.com Multi-Lingual Dictionary [home, info]
22. radical: Webster's 1828 Dictionary [home, info]
23. radical: Hutchinson's Dictionary of Difficult Words [home, info]
24. Radical: 1911 edition of the Encyclopedia Britannica [home, info]
25. radical: Free Dictionary [home, info]
26. radical: Hutchinson Dictionaries [home, info]
27. radical: Mnemonic Dictionary [home, info]
28. radical: WordNet 1.7 Vocabulary Helper [home, info]
29. radical: LookWAYup Translating Dictionary/Thesaurus [home, info]
30. radical: Dictionary/thesaurus [home, info]
31. Radical: Dictionary of Phrase and Fable (1898) [home, info]

Art (1 matching dictionary)

32. radical: Literary Criticism [home, info]

Business (1 matching dictionary)

33. radical: Legal dictionary [home, info]

Computing (4 matching dictionaries)

34. Radical: Cybernetics and Systems [home, info]
35. Radical: The Difference [home, info]
36. Radical: Unicode Glossary [home, info]
37. Radical (chemistry), radical: Encyclopedia [home, info]

Medicine (6 matching dictionaries)

38. radical: Sound Alike Words [home, info]
39. radical: online medical dictionary [home, info]
40. radical: Prostate Cancer Interactive Glossary [home, info]
41. Radical: Breast Cancer Glossary of Medical Terms [home, info]
42. Radical: General Glossary [home, info]
43. Radical (chemistry), radical: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

44. radical: Sociology [home, info]
45. radical: Political [home, info]

Science (11 matching dictionaries)

46. radical: Electrochemistry Dictionary [home, info]
47. Radical: Chemistry Dictionary [home, info]
48. Radical: Eric Weisstein's World of Chemistry [home, info]
49. Radical: Eric Weisstein's World of Mathematics [home, info]
50. radical: Botanical Terms [home, info]
51. radical (or free radical): PHYSICAL ORGANIC CHEMISTRY [home, info]
52. radical: MATH SPOKEN HERE! [home, info]
53. radical (basal): Flora of New South Wales [home, info]
54. Radical: The Orchid Lady's Illustrated Orchid Encyclopedia [home, info]
55. radical, radical, radical, radical, radical, radical: PlanetMath Encyclopedia [home, info]
56. Radical: Atmospheric Chemistry and Air Quality [home, info]

Sports (1 matching dictionary)

57. Radical: Sports Definitions [home, info]

(Note: See radicals for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (radical) ▸ noun:  a sign placed in front of an expression to denote that a root is to be extracted ▸ noun:  a character conveying the lexical meaning of a logogram ▸ noun:  a person who has radical ideas or opinions ▸ noun:  (chemistry) two or more atoms bound together as a single unit and forming part of a molecule ▸ noun:  an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than has lost an electron and will stabilize itself by stealing an electron from a nearby molecule ("In the body free radicals are high-energy particles that ricochet wildly and damage cells") ▸ noun:  (linguistics) the form of a word after all affixes are removed ▸ adjective:  arising from or going to the root ("A radical flaw in the plan") ▸ adjective:  of or relating to or constituting a linguistic root ("A radical verb form") ▸ adjective:  especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem ("Radical leaves") ▸ adjective:  (used of opinions and actions) far beyond the norm ("Radical opinions on education") ▸ adjective:  markedly new or introducing radical change ("Radical political views") ▸ Also see radicals ▸ Word origin ▸ Words similar to radical ▸ Usage examples for radical ▸ Idioms related to radical (New!) ▸ Popular adjectives describing radical ▸ Popular nouns described by radical ▸ Words that often appear near radical ▸ Rhymes of radical ▸ Invented words related to radical