Kalmar "arsenous oxide" tana nufin wani sinadari wanda ya ƙunshi arsenic da oxygen, tare da tsarin kwayoyin halitta As2O3. An kuma san shi da arsenic trioxide. Arsenous oxide wani abu ne mai guba mai guba da cutar kansa wanda tarihi ya yi amfani da shi a fannonin masana’antu da magunguna iri-iri, duk da cewa an takaita amfani da shi sosai a ‘yan shekarun nan saboda illar lafiyarsa.
