a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
orpiment 1
noundomain: substance
Princeton WordNet [ver.3.1]
English
Definition
a yellow mineral occurring in conjunction with realgar; an ore of arsenic
a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar