We found 19 dictionaries that define the word curve ball:

General (14 matching dictionaries)

1. curve ball: American Heritage Dictionary of the English Language
2. curve ball: Collins English Dictionary
3. curve ball: Vocabulary.com
4. curve-ball: Wordnik
5. curve ball: Cambridge Advanced Learner's Dictionary
6. curve ball: The Wordsmyth English Dictionary-Thesaurus
7. curve ball: Dictionary.com
8. Curve ball: Wikipedia, the Free Encyclopedia
9. curve ball: Rhymezone
10. curve ball: FreeDictionary.org
11. curve ball: Mnemonic Dictionary
12. curve ball: TheFreeDictionary.com

Computing (1 matching dictionary)

13. curve ball: Encyclopedia

Medicine (1 matching dictionary)

14. curve ball: Medical dictionary

Miscellaneous (1 matching dictionary)

15. curve ball: Idioms

Slang (2 matching dictionaries)

16. American-Australian Slang Dictionary (No longer online)
17. curve ball: Urban Dictionary

(Note: See curve_balls as well.)

Definitions from WordNet (curve ball) ▸ noun:  a baseball thrown with spin so that its path curves as it approach the batter Opposite: fastball, straight ball, fastball pitch ▸ Words similar to curve ball ▸ Usage examples for curve ball ▸ Idioms related to curve ball ▸ Wikipedia articles (New!) ▸ Words that often appear near curve ball ▸ Rhymes of curve ball ▸ Invented words related to curve ball