Definition of chlorine monoxide in English:

chlorine monoxide

noun

Chemistry
  • 1A 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).

  • 2A free radical, ClO·, formed especially in the upper atmosphere by the action of ultraviolet light on chlorofluorocarbons (CFCs) and contributing to ozone depletion.

Origin

Mid 19th century.