Wiktionary
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).
WordNet
n. a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide and weed killer [syn: arsenic, arsenous anhydride, arsenous oxide]
Wikipedia
Arsenic trioxide is an inorganic compound with the formula . This commercially important oxide of arsenic is the main precursor to other arsenic compounds, including organoarsenic compounds. Approximately 50,000 tonnes are produced annually. Many applications are controversial given the high toxicity of arsenic compounds.
This page provides supplementary chemical data on arsenic trioxide.
Usage examples of "arsenic trioxide".
The first of these is arsenic trioxide, an extremely poisonous substance.
But by now their descendants were so well adapted that food din't taste right without a bit of arsenic trioxide.