pentrough
(ˈpɛntrɒf, -ɔː-)
[f. pen n.1 3 + trough.]
A trough, channel, or conduit, usually of planks or boards, constructed to convey the water from a head of water formed by a ‘pen’ (see pen n.1 3) to the place where its force is applied, as in a water-mill. (Cf. penstock1.)
| 1793 Trans. Soc. Arts XI. 163 A Pentrough for equalizing the water falling on water-wheels. 1853 Glynn Power Water 43 There is a sluice to regulate the supply at top, fixed in the pentrough, and another at bottom which regulates the expenditure. |