English to English

noun (n)

• a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt(noun.object)

  Synonym:
  vent
  

  source: wordnet30
• a mountain formed by volcanic material(noun.object)

  source: wordnet30
• A mountain or hill, usually more or less conical in form, from which lava, cinders, steam, sulphur gases, and the like, are ejected; -- often popularly called a burning mountain.(noun)

  source: webster1913