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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]