An oxide containing one atom of oxygen in its molecule or empirical formula
A colorless, odorless toxic flammable gas formed by incomplete combustion of carbon
A chlorine oxide (dichlorine monoxide), Cl2O, an unstable yellow or orangish gas, used in chemical synthesis as a chlorinating and oxidizing agent (also called hypochlorous anhydride) (now rare).
Another term for nitric oxide.
= nitrous oxide.