‖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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.