Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

rheumatoid arthritis

noun

Medical Definition of rheumatoid arthritis

  1. :  a usually chronic disease that is considered an autoimmune disease and is characterized especially by pain, stiffness, inflammation, swelling, and sometimes destruction of joints—abbreviation RA; called also ; compare osteoarthritis




Learn More about rheumatoid arthritis


Seen and Heard

What made you want to look up rheumatoid arthritis? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

the Celtic May Day festival

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

prompt angry oily maudlin
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ