[te-trok-sahyd, -sid]
noun Chemistry.
an oxide whose molecule contains four atoms of oxygen.

1865–70; tetr- + oxide

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World English Dictionary
tetroxide or tetroxid (tɛˈtrɒksaɪd, tɛˈtrɒksɪd)
any oxide that contains four oxygen atoms per molecule: osmium tetroxide, OsO4
tetroxid or tetroxid

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Most spacecraft ever launched carried some flavor of hydrazine, either by itself or with nitrogen tetroxide as an oxidizer.
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