waygate

From way +‎ gate.

waygate (plural waygates)

1. The tailrace of a mill.
   • 1849, John Warburton, “Harvey's apparatus for cleansing potters' materials from particles of iron”, in Iron: An Illustrated Weekly Journal for Iron and Steel:

     1 and 2 are connected to one pipe, B, which leads to the pitshaft -- descends close to the side of the same — and then passes horizontally along the top of the waygate, whence branches lead off to the different workings where the men are employed

• “waygate”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• gateway, get away, get-away, getaway