(chemistry) the binary compound of nitrogen and oxygen NO; an unstable compound which rapidly oxidizes in the presence of air.

(chemistry) oxygen fluoride

(inorganic chemistry) silicon dioxide (SiO₂), silica. / (inorganic chemistry) silicon monoxide (SiO).

(chemistry) any oxide of rubidium, but especially the yellow solid Rb₂O; it is a strong base, reacting strongly with water to form the hydroxide and with acids to form normal salts

Alternative spelling of sulfur oxide

(chemistry) Any binary compound of sulfur and oxygen; either sulfur monoxide, sulfur dioxide or sulfur trioxide.

(inorganic chemistry) Any binary compound of chlorine and oxygen.

(organic chemistry) A strong-smelling liquid, ((CH₃)₂As)₂O

(chemistry) An amorphous solid, ZnO, white when pure but often pale yellow, used in pigments and cosmetics

(inorganic chemistry) A white powderous substance, CaO, normally made by heating calcium carbonate.