2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Volcanic  \Vol*can"ic\,  a.  [Cf.  F.  volcanique  It  vulcanico.] 
  1.  Of  or  pertaining  to  a  volcano  or  volcanoes;  as  volcanic 
  heat. 
 
  2.  Produced  by  a  volcano,  or  more  generally,  by  igneous 
  agencies;  as  volcanic  tufa. 
 
  3.  Changed  or  affected  by  the  heat  of  a  volcano. 
 
  {Volcanic  bomb},  a  mass  ejected  from  a  volcano,  often  of 
  molten  lava  having  a  rounded  form 
 
  {Volcanic  cone},  a  hill,  conical  in  form  built  up  of 
  cinders,  tufa,  or  lava,  during  volcanic  eruptions. 
 
  {Volcanic  foci},  the  subterranean  centers  of  volcanic  action 
  the  points  beneath  volcanoes  where  the  causes  producing 
  volcanic  phenomena  are  most  active. 
 
  {Volcanic  glass},  the  vitreous  form  of  lava,  produced  by 
  sudden  cooling;  obsidian.  See  {Obsidian}. 
 
  {Volcanic  mud},  fetid,  sulphurous  mud  discharged  by  a 
  volcano. 
 
  {Volcanic  rocks},  rocks  which  have  been  produced  from  the 
  discharges  of  volcanic  matter,  as  the  various  kinds  of 
  basalt,  trachyte,  scoria,  obsidian,  etc.,  whether  compact, 
  scoriaceous,  or  vitreous. 
 
  From  WordNet  r  1.6  [wn]: 
 
  volcanic 
  adj  1:  relating  to  or  produced  by  or  consisting  of  volcanoes; 
  "volcanic  steam";  "volcanic  islands  such  as  Iceland"; 
  "a  volcanic  cone  is  a  conical  mountain  or  hill  built 
  up  of  material  from  volcanic  eruptions" 
  2:  igneous  rock  produced  by  eruption  and  solidified  on  or  near 
  the  earth's  surface;  rhyolite  or  andesite  or  basalt; 
  "volcanic  rock  includes  the  volcanic  glass  obsidian"  [syn: 
  {eruptive}] 

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