dioxide

noun

1. (countable, uncountable)Any oxide containing two oxygen atoms in each molecule.

   “Discoid lesions and minor subacute involvement may be controlled by freezing with carbon dioxide or a course of atabrine.”

   “Kruban is a tidally-locked Venusian hothouse, its surface perpetually obscured by clouds of sulfur and carbon dioxides.”

   “Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.”