Source : Webster's Revised Unabridged Dictionary (1913)

Inferno \In*fer"no\, n. [It. See {Infernal}.]
   The infernal regions; hell. Also used fig.

         At each sudden explosion in the inferno below they
         sprang back from the brink [of the volcanic crater].
                                                  --D. C.
                                                  Worcester.

Source : WordNet®

inferno
     n 1: any place of pain and turmoil; "the hell of battle"; "the
          inferno of the engine room"; "when you're alone
          Christmas is the pits"; [syn: {hell}, {hell on earth}, {hellhole},
           {snake pit}, {the pits}]
     2: a very intense and uncontrolled fire [syn: {conflagration}]
     3: (Christianity) the abode of Satan and the forces of evil;
        where sinners suffer eternal punishment; "Hurl'd
        headlong...To bottomless perdition, there to dwell"- John
        Milton; "a demon from the depths of the pit" [syn: {Hell},
         {perdition}, {infernal region}, {nether region}, {the pit}]
        [ant: {Heaven}]