trioxide

American  

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

noun

Chemistry.

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

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trioxide British  

/ traɪˈɒksaɪd /

noun

1. any oxide that contains three oxygen atoms per molecule

   sulphur trioxide, SO3

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Etymology

Origin of trioxide

First recorded in 1865–70; tri- + oxide

Example Sentences

Researchers at Tampere University have discovered that sulfur trioxide can form products other than sulfuric acid in the atmosphere by interacting with organic and inorganic acids.

From Science Daily • May 23, 2024

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

Pure sulfuric acid is a colorless, oily liquid that freezes at 10.5 °C. It fumes when heated because the acid decomposes to water and sulfur trioxide.

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

Arsenic burns on heating in a current of oxygen, with a pale lavender-coloured flame, forming the trioxide.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" by Various