osteophyte

/ˈɑstioʊˌfaɪt/
noun
  1. A small, bony growth that forms on the edge of a bone, often near joints, sometimes causing pain or stiffness.
    • Osteophytes are common in people with arthritis as the body tries to repair joint damage.
    • His doctor said the osteophyte in his spine was pressing on a nerve, causing back pain.
    • The X-ray showed an osteophyte on her knee joint that was causing discomfort.