mofette
/moʊˈfɛt/
noun
- A hole or crack in the ground from which carbon dioxide and other gases escape, often found in volcanic areas.
- A small mofette in the field released a steady stream of invisible carbon dioxide.
- Hikers were warned to stay away from the mofette because the gas could be dangerous.
- The scientists collected gas samples from the mofette to study volcanic activity.