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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

“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


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Word History and Origins

Origin of trioxide1

First recorded in 1865–70; tri- + oxide
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Example Sentences

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

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

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

The trioxide is a white powder readily dissolved by ammonia.

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

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trio sonatatrip