Definitions

1. noun

A vent in a volcano or other geological formation through which volcanic gases escape.

“The geologist observed a fumarole on the side of the mountain, emitting steam and sulfur dioxide.”

2. noun

A pipe or vent for the escape of noxious fumes, especially in a mine or factory.

“The mine had a fumarole that needed to be ventilated to prevent the buildup of toxic gases.”