[trahy-ok-sahyd, -sid]

noun Chemistry.

an oxide containing three oxygen atoms, as As2O3.

Origin of trioxide

First recorded in 1865–70; tri- + oxide Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for trioxide

Historical Examples of 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

trioxide in Medicine




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.