n. See 3d Trone, 2. [ Obs. or Scot. ] [ 1913 Webster ]

n. [ Of Egyptian or North African origin. ] (Chem. & Min.) A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum. [ 1913 Webster ]

n. [ From Trone a steelyard. ] A toll or duty paid for weighing wool; also, the act of weighing wool. [ Obs. ] Nares. [ 1913 Webster ]

n. [ LL. See Tronage. ] An officer in London whose duty was to weigh wool. [ Obs. ] [ 1913 Webster ]

n. A throne. [ Obs. ] Chaucer. [ 1913 Webster ]

n. [ Cf. Prov. F. trogne a belly. ] A small drain. [ Obs. or Prov. Eng. ] [ 1913 Webster ]

{ } n. [ LL. trona, fr. L. trutina a balance; cf. Gr. &unr_;. ] 1. A steelyard. [ Prov. Eng. ] [ 1913 Webster ]

2. A form of weighing machine for heavy wares, consisting of two horizontal bars crossing each other, beaked at the extremities, and supported by a wooden pillar. It is now mostly disused. [ Scot. ] Jamieson. [ 1913 Webster ]

Trone stone, a weight equivalent to nineteen and a half pounds. [ Scot. ] --
Trone weight, a weight formerly used in Scotland, in which a pound varied from 21 to 28 ounces avoirdupois. [ 1913 Webster ]