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We found 50 dictionaries with English definitions that include the word onion:
Click on the first link on a line below to go directly to a page where "onion" is defined.

General (33 matching dictionaries)

1. onion: Merriam-Webster.com [home, info]
2. onion: Oxford Learner's Dictionaries [home, info]
3. onion: American Heritage Dictionary of the English Language [home, info]
4. onion: Collins English Dictionary [home, info]
5. onion: Vocabulary.com [home, info]
6. onion: Macmillan Dictionary [home, info]
7. Onion, onion, the-onion: Wordnik [home, info]
8. onion: Cambridge Advanced Learner's Dictionary [home, info]
9. Onion: InfoVisual Visual Dictionary [home, info]
10. onion: Wiktionary [home, info]
11. onion: Webster's New World College Dictionary, 4th Ed. [home, info]
12. onion: The Wordsmyth English Dictionary-Thesaurus [home, info]
13. onion: Infoplease Dictionary [home, info]
14. Onion, onion: Dictionary.com [home, info]
15. onion: Online Etymology Dictionary [home, info]
16. Onion, onion: UltraLingua English Dictionary [home, info]
17. onion: Cambridge Dictionary of American English [home, info]
18. Onion (Shannon and The Clams album), Onion (album), Onion (disambiguation), Onion (horse), Onion, The Onion, The onion, .onion: Wikipedia, the Free Encyclopedia [home, info]
19. Onion: Online Plain Text English Dictionary [home, info]
20. onion: Webster's Revised Unabridged, 1913 Edition [home, info]
21. onion: Rhymezone [home, info]
22. onion: AllWords.com Multi-Lingual Dictionary [home, info]
23. onion: Webster's 1828 Dictionary [home, info]
24. Onion: Encarta® Online Encyclopedia, North American Edition [home, info]
25. Onion: 1911 edition of the Encyclopedia Britannica [home, info]
26. onion: Free Dictionary [home, info]
27. onion: Mnemonic Dictionary [home, info]
28. onion: WordNet 1.7 Vocabulary Helper [home, info]
29. onion: LookWAYup Translating Dictionary/Thesaurus [home, info]
30. onion: Dictionary/thesaurus [home, info]
31. onion: Wikimedia Commons US English Pronunciations [home, info]

Art (4 matching dictionaries)

32. onion: Epicurus.com Spanish Glossary [home, info]
33. Onion: Encyclopedia of Spices [home, info]
34. onion: Congo Cookbook [home, info]
35. Onion: Natural Magick [home, info]

Business (1 matching dictionary)

36. ONION: Glossary of Crop Abbreviations [home, info]

Computing (1 matching dictionary)

37. onion: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

38. onion: online medical dictionary [home, info]
39. onion: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

40. ONION: Navajo Code Talkers' Dictionary [home, info]
41. onion: Idioms [home, info]

Religion (2 matching dictionaries)

42. Onion: Easton Bible [home, info]
43. Onion: Smith's Bible Dictionary [home, info]

Science (2 matching dictionaries)

44. Onion, Onion, Onion, Onion, Onion: Botanical Name listing of Plants [home, info]
45. Onion: HYPP Zoology [home, info]

Slang (3 matching dictionaries)

46. Onion: Totally Unofficial Rap [home, info]
47. Onion: Street Terms: Drugs and the Drug Trade [home, info]
48. Onion: Urban Dictionary [home, info]

(Note: See oniony for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (onion) ▸ noun:  an aromatic flavorful bulb ▸ noun:  bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb ▸ noun:  edible bulb of an onion plant ▸ Also see oniony ▸ Word origin ▸ Words similar to onion ▸ Usage examples for onion ▸ Idioms related to onion (New!) ▸ Popular adjectives describing onion ▸ Words that often appear near onion ▸ Rhymes of onion ▸ Invented words related to onion