'arsenic' definitions:

Definition of 'arsenic'

(from WordNet)
noun
A white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer [syn: arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic, ratsbane]
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 [syn: arsenic, As, atomic number 33]

Definition of 'arsenic'

From: Elements
  • Symbol: As
  • Atomic number: 33
  • Atomic weight: 74.922
  • Metalloid element of group 15. There are three allotropes, yellow, black, and grey. Reacts with halogens, concentrated oxidizing acids and hot alkalis. Albertus Magnus is believed to have been the first to isolate the element in 1250.