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We found 23 dictionaries with English definitions that include the word o:
Click on the first link on a line below to go directly to a page where "o" is defined.

General (15 matching dictionaries)

1. -o, -o-, o-: Merriam-Webster.com [home, info]
2. -o, -o-, o-: Oxford Learner's Dictionaries [home, info]
3. O'-, -o, -o-, o-: Collins English Dictionary [home, info]
4. O', -o, -o-, o', o-: Wiktionary [home, info]
5. -o, o-: Webster's New World College Dictionary, 4th Ed. [home, info]
6. o-: The Wordsmyth English Dictionary-Thesaurus [home, info]
7. O(M&T), -o, -o-, o-: Dictionary.com [home, info]
8. O(1), O(2), O(n), O-, O (Cirque du Soleil), O (Coldplay song), O (Cyrillic), O (Damien Rice album), O (Disambiguation), O (Eiko Shimamiya album), O (Flowers of Hell album), O (Maki Ohguro album), O (Oh!), O (Omarion album), O (Omarion song), O (Tilly and the Wall album), O (disambiguation), O (film), O (gesture), O (kana), O (letter), O (surname), The O (political group), The O, -o: Wikipedia, the Free Encyclopedia [home, info]
9. O': Online Plain Text English Dictionary [home, info]
10. O': AllWords.com Multi-Lingual Dictionary [home, info]
11. -o: MyWord.info [home, info]
12. -o: Stammtisch Beau Fleuve Acronyms [home, info]
13. O'-, o-: Dictionary/thesaurus [home, info]
14. O: Dictionary of Phrase and Fable (1898) [home, info]
15. o: AllWords.com Multi-Lingual Dictionary [home, info]

Business (1 matching dictionary)

16. o-: Financial dictionary [home, info]

Computing (1 matching dictionary)

17. O(1,3), O(2), O(3), O(3,1), O (element), o-: Encyclopedia [home, info]

Medicine (1 matching dictionary)

18. O (element), -o-, o-: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

19. O(M&T): Acronym Finder [home, info]
20. :-O: AbbreviationZ [home, info]

Science (2 matching dictionaries)

21. O(2): PlanetMath Encyclopedia [home, info]
22. O( ), O( ), o( ), o( ): Prime [home, info]

Slang (1 matching dictionary)

23. O'----, O-, o-, o.-, the o: Urban Dictionary [home, info]

(Note: See os for more definitions.)

Quick definitions from WordNet (os) ▸ noun:  a mouth or mouthlike opening ▸ noun:  rigid connective tissue that makes up the skeleton of vertebrates ▸ noun:  the left eye ▸ noun:  (computer science) software that controls the execution of computer programs and may provide various services ▸ noun:  a hard brittle blue-gray or blue-black metallic element that is one of the platinum metals; the heaviest metal known ▸ Also see os ▸ Words similar to o ▸ Usage examples for o ▸ Idioms related to o (New!) ▸ Popular adjectives describing o ▸ Words that often appear near o ▸ Rhymes of o ▸ Invented words related to o