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  
<noun.substance>
<noun.substance>
| As |   | 
| arsenic |   | 
| atomic number 33 |   | 
semantic pointers
hypernym
substance holonym
