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

rd

abbreviation

Definition of RD

1
road
2
rod
3
round
ADVERTISEMENT

RD

abbreviation

Definition of RD

1
registered dietitian
2
rural delivery
See RD defined for English-language learners
Medical Dictionary

rd

abbreviation

Medical Definition of RD

rutherford

Learn More About RD

Browse

4 ENTRIES FOUND:
  1. rd
  2. -rd
  3. R and D
  4. R & D
Next Word in the Dictionary: -rdPrevious Word in the Dictionary: rcvrAll Words Near: rd
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