Bezoar

Chamber's Twientieth Century Dictionary · 1908 · p. 13

bē′zōr, n. a stony concretion found in the stomachs of goats, antelopes, llamas, chamois, ., formerly esteemed an antidote to all poisons. [Through Sp. bezaar and Ar. bāzahr , from Pers. pād-zahr , counter-poison, zahr , poison.]