1. 
   geothermal
   geothermic adjective of or relating to the heat in the interior of the earth
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=geothermal
   
   
2. 
   geothermal
   geothermal 1. Relating to, or caused by, the internal heat of the earth. 2. Describing an energy system that makes use of the internal heat produced by the earth.
   Found op http://www.wordinfo.info/words/index/info/view_unit/4265/6
   
   
3. 
   geothermal
   Energy from the earth, derived as heat.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
4. 
   geothermal
   1) Energy 2) Geothermic 3) Kind of power common in iceland 4) Power produced by the earth's heat
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/geothermal/1
   
   

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