(inorganic chemistry) Any oxide of erbium, but especially the pink amorphous solid Er₂O₃ (erbia) that is used as a phosphor and in optics

(inorganic chemistry) Any oxide of terbium, but especially the white solid Tb₂O₃ (terbia)

(chemistry) The chemical compound FeO, iron oxide where iron has a valence of +2.

(chemistry) The chemical compound Fe₂O₃, iron oxide where iron has a valence of +3.

(inorganic chemistry) The solid, Al₂O₃, commonly known as alumina; it occurs as bauxite, sapphire, ruby and other forms; it is used in the manufacture of ceramics

plural of sulfur oxide

(inorganic chemistry) Either of two binary compounds of titanium and oxygen - titanium dioxide and titanium trioxide

An old term for copper(I) oxide, chemical formula Cu₂O. Used as a pigment, fungicide and antifouling ingredient.

Alternative spelling of aluminium oxide

(inorganic chemistry) Any mixture of the oxides of more than one metal, but especially the blend of plutonium and uranium oxides that is used (as MOX fuel) in nuclear reactors