The two main variables in an experiment are the independent and dependent variable. An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.
Medical Definition of RHEUMATOID ARTHRITIS. : a usually chronic disease that is considered an autoimmune disease and is characterized especially by pain, stiffness, inflammation, swelling, and sometimes destruction of jointsâabbreviation RA; called also atrophic arthritis; compare osteoarthritis.ull Definition of RHEUMATOID ARTHRITIS. : a usually chronic autoimmune disease that is characterized especially by pain, stiffness, inflammation, swelling, and sometimes destruction of joints. See rheumatoid arthritis defined for English-language learners. ADVERTISEMENT.
Medications for Rheumatoid Arthritis. What is Rheumatoid Arthritis: Rheumatoid arthritis is a chronic (long-term) inflammatory disease that primarily affects the joints and surrounding tissues, but can also affect other organ systems.