Dictionary
Thesaurus
Medical
Scrabble®
Spanish Central
Browse DictionaryBrowse Thesaurus
Get our free apps!iPhone•iPad•Android
Games
Word of the Day
Video
Blog: Words at Play
My Faves
Dictionary

RIO

abbreviation

Definition of RIO

radar intercept officer
ADVERTISEMENT

Rio

geographical name \ˈrē-(ˌ)ō\

Definition of RIO

rio de janeiro

Rhymes with RIO

Krio

Browse

22 ENTRIES FOUND:
  1. RIO
  2. Rio Grande disease
  3. Rio ipecac
  4. Rio Branco
  5. Rio de Janeiro
  6. Rio Grande
  7. Rio Grande de Cagayan
  8. Rio Grande do Norte
  9. Rio Grande do Sul
  10. Rio Rancho
  11. Branco, Rio
  12. Del Rio
  13. Grande, Rio
  14. Bravo, Río
  15. Cagayan
  16. Mbini
  17. Pinar del Río
  18. Plata, Río de la
  19. Río de la Plata
  20. Río de Oro
  21. Río Muni
  22. Río Piedras
Next Word in the Dictionary: RiodinidaePrevious Word in the Dictionary: rinsingAll Words Near: RIO
ADVERTISEMENT
10 Charming Words for Nasty People
Put-downs with flair
Learn More
When "Literally" isn't, well, literal
How to use a word that (literally) drives some people nuts.
Watch Now
Know what this is?
Test your vocab with our fun, fast game
Go Play
Fear of cats?
Ailurophobia, and 9 other unusual fears
Learn More
Join Us
Merriam-Webster
on Facebook
Merriam-Webster
on Twitter
Bookstore: Digital and Print
Merriam-Webster references for Mobile, Kindle, print, and more.
See All
Other Merriam-Webster Dictionaries