A gallstone; a hard stone-like deposit that forms in the gallbladder from hardened bile and cholesterol.
From 'bile' plus 'stone,' a compound that directly describes the composition and location of the condition. Historically used before 'gallstone' became the standard medical term.
Medieval doctors couldn't explain gallstones until they invented better ways to examine the body—they called them 'bilestones,' thinking excess bile literally crystallized into rocks.
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