We found 14 dictionaries that define the word O'Neill:

General (12 matching dictionaries)

1. O'Neill: Merriam-Webster
2. O'Neill, O'Neill: Collins English Dictionary
3. O'Neill: Vocabulary.com
4. O'Neill, ONeill, ONeill, O'neill, Oneill, oneill: Wordnik
5. O'Neill: Wiktionary
6. O'Neill: Webster's New World College Dictionary, 4th Ed.
7. o'neill, oneill: Dictionary.com
8. O'Neill, O'Neill (brand), O'Neill (disambiguation), O'Neill (surname), The O'Neill: Wikipedia, the Free Encyclopedia
9. O'neill, Oneill: Rhymezone
10. oneill: FreeDictionary.org
11. o'neill: Mnemonic Dictionary
12. O'Neill: TheFreeDictionary.com

Computing (1 matching dictionary)

13. O'Neill: Encyclopedia

Slang (1 matching dictionary)

14. o'neill: Urban Dictionary

Definitions from WordNet (O'neill) ▸ noun:  United States playwright (1888-1953) Phrases: eugene oneill, eugene gladstone oneill, oneill eugene, george bernard oneill, oneill eugene gladstone, more... ▸ Words similar to O'Neill ▸ Usage examples for O'Neill ▸ Idioms related to O'Neill ▸ Wikipedia articles (New!) ▸ Popular adjectives describing O'Neill ▸ Words that often appear near O'Neill ▸ Rhymes of O'Neill ▸ Invented words related to O'Neill