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trioxide

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

noun

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


trioxide British  
/ traɪˈɒksaɪd /

noun

  1. 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:

"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

Dry, solid xenon trioxide, XeO3, is extremely explosive—it will spontaneously detonate.

From Textbooks Feb. 14, 2019

In the form of arsenic trioxide, it can be used to treat acute promyelocytic leukemia, the book says.

From Washington Post Jun. 10, 2013

Oxidation may be effected by the addition to the glass mixture of a substance which gives up oxygen at a high temperature, such as manganese dioxide or arsenic trioxide.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" by Various

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