vulcanic

from The Collaborative International Dictionary of English v.0.48

Vulcanic \Vul*can"ic\, a.
   1. Of or pertaining to Vulcan; made by Vulcan; Vulcanian.
      [1913 Webster]

   2. Of or pertaining to volcanoes; specifically, relating to
      the geological theory of the Vulcanists, or Plutonists.
      [1913 Webster]