(inorganic chemistry) A chemical compound with the formula SiO. In the atmosphere it oxidizes quickly into SiO₂, but has been detected in stellar objects and has been described as the most common oxide of silicon in the universe.

A humorous chemical name for "water."

Alternative spelling of dihydrogen monoxide

(inorganic chemistry) The chemical compound Cl₂O which, at room temperature, exists as a brownish-yellow gas soluble in both water and organic solvents.