rheumatoid factor

noun

Definition of rheumatoid factor 

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

First Known Use of rheumatoid factor

1949, in the meaning defined above

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The first known use of rheumatoid factor was in 1949

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rheumatoid factor

noun

Medical Definition of rheumatoid factor 

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

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Britannica.com: Encyclopedia article about rheumatoid factor

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