noun Date: 1868 a silver-white mineral consisting of a combined sulfide and arsenide of iron that occurs in prismatic orthorhombic crystals or in masses or grains and that is the principal source of arsenic
ARSENOPYRITE
Meaning of ARSENOPYRITE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012