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We found 18 dictionaries with English definitions that include the word r:
Click on the first link on a line below to go directly to a page where "r" is defined.

General (6 matching dictionaries)

1. 'R, 'r, -r: Wordnik [home, info]
2. -r: The Wordsmyth English Dictionary-Thesaurus [home, info]
3. R(D), R(t): Dictionary.com [home, info]
4. R-, R. (album), R (James Bond), R (Los Angeles Railway), R (New York City Subway service), R (cable operator), R (complexity), R (cross section ratio), R (disambiguation), R (film), R (language), R (programming language), R (software), The r: Wikipedia, the Free Encyclopedia [home, info]
5. R: Stammtisch Beau Fleuve Acronyms [home, info]
6. r, r: Wordnik [home, info]

Art (2 matching dictionaries)

7. R: Virginia Tech Multimedia Music Dictionary [home, info]
8. r: Glossary of Stamp Collecting Terms [home, info]

Business (1 matching dictionary)

9. r (letter): Financial dictionary [home, info]

Computing (1 matching dictionary)

10. /r, r (letter): Encyclopedia [home, info]

Medicine (3 matching dictionaries)

11. R (symbol): MedTerms.com Medical Dictionary [home, info]
12. R-, r (letter): Medical dictionary [home, info]
13. R (symbol): Drug Medical Dictionary [home, info]

Miscellaneous (3 matching dictionaries)

14. R(D), R(t): Acronym Finder [home, info]
15. :-R: AbbreviationZ [home, info]
16. r: AbbreviationZ [home, info]

Science (1 matching dictionary)

17. R-: Eric Weisstein's World of Mathematics [home, info]

Slang (1 matching dictionary)

18. The R: Urban Dictionary [home, info]

(Note: See rs for more definitions.)

Quick definitions from Wiktionary (Rs) ▸ noun:  (Mormonism) Initialism of Relief Society. ▸ noun:  Initialism of Rio Grande do Sul. (a state of Brazil) ▸ noun:  (fandom slang) Initialism of Pokémon Ruby and Sapphire. ▸ noun:  Initialism of recommended standard. ▸ noun:  (knitting) Initialism of right side. ▸ noun:  (military, US) Initialism of recruiting station. ▸ noun:  Initialism of religious studies. ▸ Also see rs ▸ Words similar to r ▸ Usage examples for r ▸ Popular adjectives describing r ▸ Words that often appear near r ▸ Rhymes of r ▸ Invented words related to r