▪ I. ˈtrunnel
dial. form of trundle n. Also in comb. trunnel-head U.S., a circular plate or disc at the head of a coke-oven or in a furnace; trunnel-hole, the aperture or throat of a puddling furnace in which this disc works.
| 1819 E. Evans Pedestrious Tour 270 The cogs, wallower, the trunnel-head and the stones [of a grist-mill]. 1839 Knickerbocker XIII. 345 Mill-wheels, and trunnel-heads. 1868 Joynson Metals 16 The opening at the top of the furnace, called the throat or trunnel-hole. 18.. Amer. Manuf. LXII. 626 (Cent. Suppl.) The trunnel-head, or ring, is a much more important part of a coke oven than most people imagine. |
▪ II. trunnel, -ell
variants of treenail.