A bezoar stone; a hard mass found in the stomach or intestines of some animals, especially wild goats, formed from indigestible material like hair or plant fibers.
From Greek 'aegagros' (wild goat) combined with 'pilos' (hair, felt), literally meaning 'wild-goat hair-ball.' The term entered scientific Latin as a zoological and medical term for these mysterious stones.
Medieval alchemists obsessed over bezoar stones and called them 'bezars'—they genuinely believed they could cure poison and heal almost any disease, leading to wild trade routes and royal collections!
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