1. 
   Retorting
   The heating of oil shale to get the oil out from it.
   Found op http://www.neo.ne.gov/statshtml/glossaryr.htm
   
   
2. 
   Retorting
   • (p. pr. & vb. n.) of Retort
   Found op http://thinkexist.com/dictionary/meaning/retorting/
   
   
3. 
   retorting
   1) The heating of oil shale to get the oil out from it
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/retorting/1
   
   

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