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
Open English WordNet
Arsenic is a chemical element; it has symbol As and atomic number 33.
A toxic metalloid element with symbol As and atomic number 33, existing in several allotropic forms, that occurs principally in realgar and orpiment and as the free element. It is used in semiconductors, lead-based alloys, and high temperature brasses.
A nonmetallic chemical element (symbol As) with an atomic number of 33.