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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

Both antimony trioxide and the suite of haloacetic acids have previously been recognized by state and federal agencies as hazardous substances.

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

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

From Washington Post Jun. 10, 2013

Chromium forms three series of compounds, namely the chromous salts corresponding to CrO, chromous oxide, chromic salts, corresponding to Cr2O3, chromium sesquioxide, and the chromates corresponding to CrO3, chromium trioxide or chromic anhydride.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" by Various

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