Hypertext Webster Gateway: "trioxide"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Trioxide \Tri*ox"ide\, n. [Pref. tri- + oxide.] (Chem.)
An oxide containing three atoms of oxygen; as, sulphur
trioxide, {SO3}; -- formerly called {tritoxide}.
From WordNet (r) 1.7 (wn)
trioxide
n : an oxide containing three atoms of oxygen in the molecule
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