arthritis
n. uncountablen. a medical condition that makes your joints feel painful, stiff, and swollen. It often makes it hard to move your fingers, knees, or back easily.
n. inflammation of one or more joints, causing pain and stiffness that can worsen with age. Often used as a general term for over 100 different conditions affecting the musculoskeletal system.
My grandmother has arthritis in her hands.
The doctor recommended swimming because it is a low-impact exercise that doesn't hurt patients with arthritis.
While rheumatoid arthritis is an autoimmune disorder, osteoarthritis is primarily characterized by the mechanical wear and tear of cartilage over several decades.
From Latin arthrītis, from Ancient Greek ἀρθρῖτις (arthrîtis, “joint-disease, gout”), from ἄρθρον (árthron, “a joint”). By surface analysis, arthr- + -itis.
Typically used without an article when referring to the condition generally; can be modified by a specific body part ('arthritis of the knee').