The definition of arthritis is an inflammatory condition of a joint in the body that can cause pain, swelling or stiffness.(noun)
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.
See arthritis in Webster's New World College Dictionary
Origin: L < Gr < arthron (see arthro-) + -itis
See arthritis in American Heritage Dictionary 4
Learn more about arthritis