arsenic

Meanings

• a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
• 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

Synonyms

arsenic trioxide, arsenous anhydride, arsenous oxide, As, atomic number 33, ratsbane, white arsenic