arsenic

Noun

• 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

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

Related words

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