1. 
   Sillon
   Sil'lon noun [ French, a furrow.] (Fort.) A work raised in the middle of a wide ditch, to defend it. Crabb.
   Found op http://www.encyclo.co.uk/webster/S/103
   
   
2. 
   Sillon
   • (n.) A work raised in the middle of a wide ditch, to defend it.
   Found op http://thinkexist.com/dictionary/meaning/sillon/
   
   
3. 
   Sillon
   In fortifications, a sillon is a defensive work raised in the middle of a wide ditch, to defend it.
   Found op http://www.probertencyclopaedia.com/browse/FS.HTM
   
   

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