trioxide

[ trahy-ok-sahyd, -sid ]

noun

, Chemistry.

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

trioxide

/ traɪˈɒksaɪd /

noun

1. any oxide that contains three oxygen atoms per molecule

   sulphur trioxide, SO3

Word History and Origins

Origin of trioxide¹

First recorded in 1865–70; tri- + oxide

Example Sentences

Sulphur trioxide forms thin needle-shaped crystals, arranged in feathery groups.

From Project Gutenberg

It is weighed when cold, and is the trioxide or "tungstic acid" (WO3), which contains 79.31 per cent.

From Project Gutenberg

All molybdenum compounds are converted into the trioxide by boiling with nitric acid.

From Project Gutenberg

The trioxide is a white powder readily dissolved by ammonia.

From Project Gutenberg

These are the borates in which the trioxide (B2O3) acts the part of a weak acid.

From Project Gutenberg