| antimony trioxide | Sb2O3;used technically in paints and flame-proofing; also used as an expectorant and emetic. Synonym: antimonous oxide, antimony oxide, flowers of antimony. Abbreviation: Sb (05 Mar 2000) |
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| arsenic trioxide | As2O3;dissolves in water to give arsenous acid, H3AsO3; used in the treatment of skin diseases and malaria, and as a tonic; also used externally as a caustic. Synonym: arsenous oxide, white arsenic. (05 Mar 2000) |
| sulfur trioxide | SO3;forms sulfuric acid, H2SO4, by its reaction with water. Synonym: sulfuric oxide. (05 Mar 2000) |
| trioxide | <chemistry> An oxide containing three atoms of oxygen; as, sulphur trioxide, SO3; formerly called tritoxide. Origin: Pref. Tri- + oxide. Source: Websters Dictionary (01 Mar 1998) |