volcano
- A geological formation, typically a mountain, having a vent through which lava, rock fragments, hot vapor, and gas are or have been erupted from the Earth's crust. nounThe eruption of the volcano caused widespread damage to the surrounding area.Scientists monitor the volcano for any signs of increased activity.
- A metaphorical term used to describe a situation or person that is volatile or potentially explosive. nounThe political situation in the region is like a volcano, ready to erupt at any moment.His temper is a volcano, unpredictable and dangerous when provoked.