1. A very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar
   - arsenic, As

Type of: chemical element, element

Part of: arsenopyrite, herbicide, insect powder, insecticide, mispickel, orpiment, realgar, weed killer, weedkiller