Usually means: Layered vegetable used in cooking.
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We found 46 dictionaries that define the word onion:

General (28 matching dictionaries)
  1. onion: Longman Dictionary of Contemporary English
  2. onion: Merriam-Webster
  3. onion: Oxford Learner's Dictionaries
  4. onion: American Heritage Dictionary of the English Language
  5. onion: Collins English Dictionary
  6. onion: Vocabulary.com
  7. Onion, onion, the-onion: Wordnik
  8. onion: Cambridge Advanced Learner's Dictionary
  9. Onion: InfoVisual Visual Dictionary
  10. onion: Wiktionary
  11. onion: Webster's New World College Dictionary, 4th Ed.
  12. onion: The Wordsmyth English Dictionary-Thesaurus
  13. onion: Infoplease Dictionary
  14. Onion, onion: Dictionary.com
  15. onion: Online Etymology Dictionary
  16. onion: Cambridge Essential American English Dictionary
  17. Onion (Shannon and The Clams album), Onion (album), Onion (disambiguation), Onion (horse), Onion, The Onion, The onion, .onion: Wikipedia, the Free Encyclopedia
  18. Onion: Online Plain Text English Dictionary
  19. onion: Webster's Revised Unabridged, 1913 Edition
  20. onion: Rhymezone
  21. onion: AllWords.com Multi-Lingual Dictionary
  22. onion: Webster's 1828 Dictionary
  23. onion: FreeDictionary.org
  24. onion: Mnemonic Dictionary
  25. onion: TheFreeDictionary.com
  26. onion: Wikimedia Commons US English Pronunciations

Art (4 matching dictionaries)
  1. Epicurus.com Spanish Glossary (No longer online)
  2. Encyclopedia of Spices (No longer online)
  3. Congo Cookbook (No longer online)
  4. Natural Magick (No longer online)

Business (1 matching dictionary)
  1. Glossary of Crop Abbreviations (No longer online)

Computing (1 matching dictionary)
  1. onion: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. onion: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. onion: Idioms

Religion (2 matching dictionaries)
  1. Onion: Easton Bible
  2. Onion: Smith's Bible Dictionary

Science (2 matching dictionaries)
  1. Onion, Onion, Onion, Onion, Onion: Botanical Name listing of Plants
  2. Onion: HYPP Zoology

Slang (4 matching dictionaries)
  1. onion, onion, onion: Green’s Dictionary of Slang
  2. Totally Unofficial Rap (No longer online)
  3. Onion: Street Terms: Drugs and the Drug Trade
  4. Onion: Urban Dictionary

(Note: See onions as well.)

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Definitions from Wiktionary (
)
American English Definition British English Definition
▸ noun:  A monocotyledonous plant (Allium cepa), allied to garlic, used as vegetable and spice.
▸ noun:  The bulb of such a plant.
▸ noun:  A plant of the genus Allium as a whole.
▸ noun:  (slang, of a drug) An ounce.
▸ noun:  (obsolete baseball slang) A ball.
▸ noun:  (obsolete, slang) A watch-seal.
▸ noun:  (4chan, slang) Soy, particularly when used in compound words related to the soy boy stereotype.
▸ noun:  (Bermuda, slang) An inhabitant of Bermuda; a Bermudian.
▸ noun:  Alternative letter-case form of Onion (“an inhabitant of Bermuda; a Bermudian”) [(Bermuda, slang) An inhabitant of Bermuda; a Bermudian.]

Similar:
allium cepa, onion plant, garlic, allium, spring onion, onion seed, shallot, walking onion, ramson, leek, more...

Opposite:
garlic, leek, chive

Types:
red onion, white onion, yellow onion, shallot, green onion, leek, scallion, pearl onion, more...

Phrases:
red onion, green onion, onion soup, onion rings, Onion powder, more...

Adjectives:
small, large, chopped, red, green, yellow, sliced, white, wild, raw, grated

Colors:
    purple,     white,     yellow,     red,     brown, more...


▸ Word origin

▸ Words similar to onion

▸ Usage examples for onion

▸ Idioms related to onion

▸ Wikipedia articles (New!)

▸ Popular adjectives describing onion

▸ Words that often appear near onion

▸ Rhymes of onion

▸ Invented words related to onion

Similar:
allium cepa, onion plant, garlic, allium, spring onion, onion seed, shallot, walking onion, ramson, leek, more...

Opposite:
garlic, leek, chive

Types:
red onion, white onion, yellow onion, shallot, green onion, leek, scallion, pearl onion, more...

Phrases:
red onion, green onion, onion soup, onion rings, Onion powder, yellow onion, onion skin, White onion, spring onion, wild onion, onion salt, onion domes, Spanish onion, onion bulb, onion skinning, onion dome, more...

Adjectives:
small, large, chopped, red, green, yellow, sliced, white, wild, raw, grated

Colors:
    purple,     white,     yellow,     red,     brown, more...



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