mud volcano

noun

1. a vent in the earth's surface through which escaping gas and vapor issue, causing mud to boil and occasionally to overflow, forming a conical mound around the vent.

mud volcano

noun

1. a cone-shaped mound formed from fine mud ejected, with gases and water, from hot springs, geysers, etc, in volcanic regions

Word History and Origins

Origin of mud volcano¹

First recorded in 1810–20