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boyau |
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