We found 28 dictionaries that define the word yo-yo:

General (22 matching dictionaries)

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

Art (1 matching dictionary)

21. Technical Glossary of Theatre Terms (No longer online)

Business (1 matching dictionary)

22. Yo-Yo: Investopedia

Computing (2 matching dictionaries)

23. yo-yo: CCI Computer
24. yo-yo: Encyclopedia

Miscellaneous (1 matching dictionary)

25. yo-yo: A Word A Day

Slang (1 matching dictionary)

26. yo-yo: Urban Dictionary

(Note: See yo-yoed as well.)

Definitions from WordNet ( ) ▸ noun:  a toy consisting of a spool that is reeled up and down on a string by motions of the hand Similar: Yoyo, yo-yo de-spin, loop-the-loop, spinning top, yarnwindle, whizgig, spinning wheel, whorl, winder, ring spinner, more... Opposite: stationary, fixed, stable, immobile Types: butterfly, looping, offstring, counterweight, 2A, 3A, 4A, 5A, modern responsive, more... Phrases: yo-yo dieting, Yo-Yo Ma, ma, yo-yo, yo-yo stock, Yo-yo club, more... Colors:     red,     blue,     yellow,     green,     orange, more... ▸ Word origin ▸ Words similar to yo-yo ▸ Usage examples for yo-yo ▸ Idioms related to yo-yo ▸ Wikipedia articles (New!) ▸ Popular adjectives describing yo-yo ▸ Words that often appear near yo-yo ▸ Rhymes of yo-yo ▸ Invented words related to yo-yo