A hard indigestible mass of material, such as hair, vegetable fibers, or fruits, found in the stomachs or intestines of animals, especially ruminants, and human beings.

• 毛粪石在动物，尤指反刍动物和人的肠胃中发现的一种难消化的硬块，如头发、蔬菜纤维或果实。