sb. [f. TROUGH sb. + -ING1 1 g.] Troughs collectively; provision of troughs; a set or system of troughs.
1825. J. Nicholson, Operat. Mechanic, 85. The openings in the bottom of the troughing should be of iron.
1904. Daily Chron., 31 Dec., 6/7. On the walls of the tunnels 153 miles of troughing have been fixed to carry the cables.
