Arsenous oxide is a compound that is also known as arsenic trioxide or white arsenic. This toxic and highly poisonous substance is used in a variety of industrial processes and as a pesticide. However, due to its dangerous properties, it is important to be aware of synonyms for arsenous oxide that may be used on product labels or in scientific studies. Some common synonyms for arsenous oxide include arsenic acid, arsenic anhydride, arsenic sesquioxide, and arsenious acid. It is important to keep in mind that while these terms may refer to the same substance, they should always be handled with extreme caution and only by trained professionals.