Illustrated Glossary of Organic Chemistry

Epoxide (oxirane): A heterocycle of molecular formula C2H4O consisting of a three-membered ring with two carbons and one oxygen. This molecule is also called ethylene oxide. Also refers to any molecule that contains the oxirane ring system.

Molecular Structure of Oxirane (Ethylene Oxide)

Lewis structure
Ball and spoke
Space filling model
Molecular model kit

Styrene oxide, a typical epoxide.