an oxide containing three oxygen atoms, as As2O3.
Origin of trioxide
First recorded in 1865–70; tri-
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for trioxide
Historical Examples of trioxide
An impure oxysulphide of antimony, with variable portions of trioxide, and undecomposed tersulphide.
A mixture of trioxide of antimony, sulphide of potassium, carbonate of potassium, and undecomposed trisulphide of antimony.
Pure antimony is quite permanent in air at ordinary temperatures, but when heated in air or oxygen it burns, forming the trioxide.
Arsenic trioxide has been known from the earliest times, and was called Httenrauch (furnace-smoke) by Basil Valentine.
Arsenic burns on heating in a current of oxygen, with a pale lavender-coloured flame, forming the trioxide.
British Dictionary definitions for trioxide
any oxide that contains three oxygen atoms per moleculesulphur trioxide, SO 3
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
An oxide containing three oxygen atoms per molecule.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.