The definition of arthritis is an inflammatory condition of a joint in the body that can cause pain, swelling or stiffness.
An example of arthritis is when an older person has difficulty using their hands to write or do other tasks because of stiffness in the joints.
inflammation of a joint or joints, esp. as in rheumatoid arthritis
Origin of arthritisClassical Latin from Classical Greek from arthron (see arthro-) + -itis
Any of several diseases of the joints, such as osteoarthritis or rheumatoid arthritis, characterized by pain, swelling, and often stiffness, and usually involving inflammation.