gallstone

/ˈɡɔːl stoʊn/
noun
  1. A small, hard, pebble-like mass that forms in the gallbladder, often causing pain.
    • Eating a high-fat diet can increase the risk of developing a gallstone.
    • He had surgery to remove several gallstones from his gallbladder.
    • The doctor said her abdominal pain was caused by a gallstone blocking a duct.