arsenous anhydride arsenous • arsenous oxide · · · Info · Definitions · Synonyms · Characters · · arsenous anhydride · · Text Common · · Latin · · Scripts 18 · · Length 6 · · Syllables Definitions · · · (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer. Synonyms: arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic, ratsbane. · · Noun Definition 1 Synonyms · · · arsenic · · Synonym 1 arsenic trioxide · · Synonym 2 arsenous oxide · · Synonym 3 white arsenic · · Synonym 4 ratsbane · · Synonym 5 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075 y latin small letter y U+0079