Definitions

1. noun

A chemical compound consisting of two oxygen atoms.

“The emissions from the factory contained carbon dioxide, a major contributor to global warming.”

2. noun

A chemical compound containing two atoms of a particular element combined with oxygen.

“The dioxide of carbon is a major component of fossil fuels.”

3. noun

A compound of two atoms of the same element combined with oxygen.

“The dioxide of sulfur is a toxic gas often released during volcanic eruptions.”