Sillon

Sil'lon noun [ French, a furrow.] (Fort.) A work raised in the middle of a wide ditch, to defend it. Crabb.
Found on http://www.encyclo.co.uk/webster/S/103

Sillon

• (n.) A work raised in the middle of a wide ditch, to defend it.
Found on http://thinkexist.com/dictionary/meaning/sillon/

Sillon

In fortifications, a sillon is a defensive work raised in the middle of a wide ditch, to defend it.
Found on http://www.probertencyclopaedia.com/browse/FS.HTM
No exact match found