Tetroxide
Pronunciation : Tet*rox"ide
Part of Speech : n.
Etymology : [Tetra- + oxide.] (Chem.)
Definition : Defn: An oxide having four atoms of oxygen in the molecule; a quadroxide; as, osmium tetroxide, OsO.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder