1. 
   undecagon
   [n] - an eleven-sided polygon
   Found op http://www.webdictionary.co.uk/definition.php?query=undecagon
   
   
2. 
   Undecagon
   An eleven sided polygon. Each internal angle is 147.3° and the sum of the internal angles is 1620°. See also: Polygon.
   Found op http://www.diracdelta.co.uk/science/source/u/n/undecagon/source.html
   
   
3. 
   undecagon
   <geometry> A figure having eleven angles and eleven sides. ... Origin: L. Undecim eleven + Gr. An angle. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?undecagon
   
   
4. 
   undecagon
   noun an eleven-sided polygon
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=undecagon
   
   
5. 
   Undecagon
   • (n.) A figure having eleven angles and eleven sides.
   Found op http://thinkexist.com/dictionary/meaning/undecagon/
   
   
6. 
   Undecagon
   An undecagon is an eleven-sided polygon.
   Found op http://www.probertencyclopaedia.com/browse/GU.HTM
   
   
7. 
   undecagon
   1) An eleven-sided polygon 2) Polygon 3) Polygonal shape
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/undecagon/1
   
   

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