solfatara noun. 
[sɒlfǝ'tɑ:rǝ] Also earlier solfaterra 
[-'tɛrǝ]. 
L18.[A sulphurous volcano near Naples, from Italian solfo sulphur.]Geology. A fumarole which emits sulphurous gases, encrusting the edge with sulphur etc. Cf. 
SOUFRIèRE.
 ■   solfataric adjective of or pertaining to solfataras; designating (the stage of) volcanic activity in which sulphurous gases are emitted from vents: 
L19.  [TahlilGaran] English Dictionary ▲