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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Boyau  \Boy"au\,  n.;  pl  {Boyaux}  or  {Boyaus}.  [F.  boyau  gut,  a 
  long  and  narrow  place  and  (of  trenches)  a  branch.  See 
  {Bowel}.]  (Fort.) 
  A  winding  or  zigzag  trench  forming  a  path  or  communication 
  from  one  siegework  to  another,  to  a  magazine,  etc