'Boyau' definitions:

Definition of 'Boyau'

From: GCIDE
  • 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. [1913 Webster]