from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A poisonous, white amorphous powder, As2O3, used in insecticides, rat poisons, and weed killers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An industrially important oxide of arsenic that occurs as the mineral claudetite; formula As2O3 (though in liquid, gaseous and some solid forms it has molecules of the form As4O6).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
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