arsenic trioxide

== English == === Noun === arsenic trioxide (uncountable) (inorganic chemistry) An industrially important and highly toxic 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). ==== Usage notes ==== Often colloquially called simply arsenic as the common form in such things as old style rat poison. ==== Translations ====