1. 
   Decagonal
   De·cag'o·nal adjective Pertaining to a decagon; having ten sides.
   Found op http://www.encyclo.co.uk/webster/D/13
   
   
2. 
   Decagonal
   • (a.) Pertaining to a decagon; having ten sides.
   Found op http://thinkexist.com/dictionary/meaning/decagonal/
   
   
3. 
   decagonal
   1) Having all angles equal to 144 degrees
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/decagonal/1
   
   

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