noun
: an orifice in the earth from which gas or vapor issues either through a pool of mud or with the ejection of mud which may accumulate in a conical mound — compare air volcano
noun
: an orifice in the earth from which gas or vapor issues either through a pool of mud or with the ejection of mud which may accumulate in a conical mound — compare air volcano
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012