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trioxide

[trahy-ok-sahyd, -sid]
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noun Chemistry.
  1. an oxide containing three oxygen atoms, as As2O3.

Origin of trioxide

First recorded in 1865–70; tri- + oxide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for trioxide

trioxide

noun
  1. 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

trioxide

(trī-ŏksīd′)
n.
  1. 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.