Meaning & use
Trioxide
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A chemical compound consisting of three oxygen atoms combined with another element or group.
See it in a sentence
Sulfur trioxide is a key intermediate in the production of sulfuric acid.
Arsenic trioxide has been used both as a poison and, in controlled doses, as a medical treatment.
A note on using this word
The prefix "tri-" indicates three oxygen atoms, distinguishing compounds like chromium trioxide from monoxides or dioxides of the same element.
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