(inorganic chemistry) A white powder (MgO) with a high melting point; it occurs naturally as periclase, an ore of magnesium.

(organic chemistry) diethyl ether.

(chemistry) A thermoplastic polyether resin whose repeat unit is derived from hydroquinone

plural of arsine oxide

plural of arene oxide

(inorganic chemistry) Any oxide of ytterbium, but especially the colourless solid Yb₂O₃ (ytterbia)

(inorganic chemistry) Any oxide of lutetium, but especially the white solid Lu₂O₃ (lutecia)

(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.