trioxide Chem.
(traɪˈɒksaɪd)
[f. tri- 5 + oxide.]
A compound of three atoms of oxygen with an element or radical; e.g. sulphur trioxide, SO3; nitrogen trioxide, N2O3.
| 1868 Fownes Elem. Chem. (ed. 10) 134 A series of oxides containing quantities of oxygen in the proportion of the numbers 1, 2, 3, united with a constant quantity of another element, are distinguished as monoxide, dioxide, and trioxide respectively. 1911 Roscoe & Schorlemmer Treat. Chem. (ed. 4) I. 723 Boron Trioxide, B2O3,..is obtained when boron burns in the air, or in oxygen. |