the.com/osteoarthritis

means A degenerative joint disease in which the protective cartilage cushioning the ends of bones wears down over time, causing pain, stiffness, and reduced movement, most often in knees, hips, hands, and spine.

from Built from Greek pieces: 'osteo-' (bone, from osteon), 'arthro-' (joint, from arthron), and '-itis' (inflammation). The '-itis' suffix is a bit of a holdover — osteoarthritis is mostly wear-and-tear degeneration rather than a true inflammatory disease like its cousin rheumatoid arthritis, but the name stuck from 19th-century medical convention, when '-itis' was the default label for joint ailments.