volcano

n. (pl. -es) 1 mountain or hill from which lava, steam, etc. Escape through openings in the earth's crust. 2 volatile situation. [latin volcanus vulcan, roman god of fire]

n. 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.