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

rheumatoid factor

noun

Definition of rheumatoid factor

  1. :  an autoantibody of high molecular weight that reacts against IgG immunoglobulins and is often present in rheumatoid arthritis



1949

First Known Use of rheumatoid factor

1949


Medical Dictionary

rheumatoid factor

noun

Medical Definition of rheumatoid factor

  1. :  an autoantibody of high molecular weight that reacts against immunoglobulins of the class IgG and is often present in rheumatoid arthritis




Learn More about rheumatoid factor


Seen and Heard

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

WORD OF THE DAY

a very small amount

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alphabet-pasta-spelling-help

Which is the correct spelling?

acommadate acommodate accomodate accommodate
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