arthritis - definition of arthritis by The Free Dictionary
ar·thri·tis (är-thrī′tĭs) n. Any of several diseases of the joints, such as osteoarthritis or rheumatoid arthritis, characterized by pain, swelling, and often stiffness, and usually involving inflammation. ar·thrit′ic (-thrĭt′ĭk) adj. & n. ar·thrit′i·cal·...