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trioxide

American

[trahy-ok-sahyd, -sid] / traɪˈɒk saɪd, -sɪd /

noun

Chemistry.

an oxide containing three oxygen atoms, as As 2 O 3 .

trioxide British

/ traɪˈɒksaɪd /

noun

any oxide that contains three oxygen atoms per molecule

sulphur trioxide, SO3

"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

Etymology

Origin of trioxide

First recorded in 1865–70; tri- + oxide

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

trioxide

A metallic compound, molybdenum trioxide can be used to make tough, heat-resistant alloys used in armored vehicles or missile engines.

From The Wall Street Journal ● Nov. 3, 2026

"It may be that in normal conditions phosphorus is bound up in another molecule such as phosphorus trioxide," explained Beiler.

From Science Daily ● Nov. 9, 2025

These include antimony trioxide, which is often used in plastic production and flame retardants for consumer products, and six haloacetic acids that may be produced during chlorine-based disinfection processes for drinking water.

From Salon ● Jan. 12, 2022

The heating process causes the loss of more sulfur trioxide than water, until reaching a concentration of 98.33% acid.

From Textbooks ● Feb. 14, 2019

There are three known oxides of antimony, the trioxide Sb4O6 which is capable of combining with both acids and bases to form salts, the tetroxide Sb2O4 and the pentoxide Sb2O5.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" by Various

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023