Definition of pentrough in US English:

pentrough

(also pentrow)

noun

historical
  • A trough, channel, or conduit, usually made of wooden boards, for conveying water from a weir, dam, etc., to the top of the wheel in a watermill.

Origin

Late 18th century; earliest use found in Transactions of the Society of Arts. From pen + trough.

Pronunciation

pentrough

/ˈpɛntrɒf/