We found 28 dictionaries that define the word ping-pong:

General (21 matching dictionaries)

1. Ping-Pong, ping-pong: Merriam-Webster
2. Ping-Pong: Oxford Learner's Dictionaries
3. Ping-Pong: American Heritage Dictionary of the English Language
4. Ping-Pong, Ping-Pong: Collins English Dictionary
5. Ping-Pong: Vocabulary.com
6. Ping-Pong, Ping-pong, ping-pong: Wordnik
7. Ping-Pong, ping-pong: Cambridge Advanced Learner's Dictionary
8. ping-pong: Wiktionary
9. Ping-Pong: Webster's New World College Dictionary, 4th Ed.
10. Ping-Pong: The Wordsmyth English Dictionary-Thesaurus
11. ping-pong: Infoplease Dictionary
12. Ping-pong, ping-pong: Dictionary.com
13. ping-pong: Cambridge Essential American English Dictionary
14. Ping-Pong, Ping-pong: Wikipedia, the Free Encyclopedia
15. Ping-pong: Rhymezone
16. ping-pong: FreeDictionary.org
17. ping-pong: Mnemonic Dictionary
18. Ping-Pong: TheFreeDictionary.com
19. ping-pong: Wikimedia Commons US English Pronunciations

Computing (2 matching dictionaries)

20. ping-pong: Free On-line Dictionary of Computing
21. ping-pong: Encyclopedia

Medicine (1 matching dictionary)

22. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

23. Ping-Pong: A Word A Day

Slang (2 matching dictionaries)

24. ping-pong, ping-pong, ping-pong, ping-pong: Green’s Dictionary of Slang
25. Ping-Pong: Urban Dictionary

Sports (1 matching dictionary)

26. Hickok Sports Glossaries (No longer online)

(Note: See ping-ponging as well.)

Definitions from Wiktionary (Ping-pong) ▸ noun:  Alternative form of ping pong [table tennis.] ▸ verb:  Alternative form of ping pong [(transitive, intransitive) To figuratively bounce or be bounced back and forth.] Similar: table tennis, pocket-pool, dogpaddle, ringtoss, tenniquoits, tenikoits, ballpen, tennikoits, dropshot, gameball, more... Opposite: unping, pongless Phrases: ping-pong ball, ping-pong table, ping-pong fracture, ping-pong diplomacy, Ping-pong scheme, more... Colors:     white,     black,     orange,     green,     blue, more... ▸ Words similar to ping-pong ▸ Usage examples for ping-pong ▸ Idioms related to ping-pong ▸ Wikipedia articles (New!) ▸ Popular adjectives describing ping-pong ▸ Words that often appear near ping-pong ▸ Rhymes of ping-pong ▸ Invented words related to ping-pong