Examples from the Web for trioxide
When heated to a higher temperature chromic hydroxide is completely dehydrated, forming the trioxide Cr2O3.An Elementary Study of Chemistry|William McPherson
It is weighed when cold, and is the trioxide or "tungstic acid" (WO3), which contains 79.31 per cent.
The Flowers of Antimony is an impure oxysulphide of antimony, with variable proportions of trioxide and undecomposed trisulphide.Poisons: Their Effects and Detection|Alexander Wynter Blyth
The quantity of the borate taken should contain not more than 0.2 gram of the trioxide.
All molybdenum compounds are converted into the trioxide by boiling with nitric acid.