Bezoar

A bezoar /ˈbiːzɔər/ is a mass found trapped in the gastrointestinal system (Gastrolith, usually in the stomach), though it can occur in other locations. A pseudobezoar is an indigestible object introduced intentionally into the digestive system.

There are several varieties of bezoar, some of which have inorganic constituents and others organic. The term has both a modern (medical, scientific) and a traditional usage.