Gallstones

n. abnormal stonelike mass which forms in the gallbladder

In medicine, gallstones (choleliths) are crystalline bodies formed within the body by accretion or concretion of normal or abnormal bile components.Gallstones can occur anywhere within the biliary tree, including the gallbladder and the common bile duct. Obstruction of the common bile duct is choledocholithiasis; obstruction of the biliary tree can cause jaundice; obstruction of the outlet of the pancreatic exocrine system can cause pancreatitis. Cholelithiasis is the presence of stones in the gallbladder—chole- means "gall bladder", lithia meaning "stone", and -sis means "process".
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A gallstone is a solid crystal deposit that forms in the gallbladder, which is a pear-shaped organ that stores bile salts [more]Gallstones - Community and Resources

Noun
1. a calculus formed in the gall bladder or its ducts
(synonym) bilestone
(hypernym) calculus, concretion

Stones in the gallbladder or in the duct leading from the gallbladder to the intestine. There are many types of gallstones.