Medical Definition of Trones
1. 1. A steelyard. 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. Trone stone, a weight equivalent to nineteen and a half pounds. Trone weight, a weight formerly used in Scotland, in which a pound varied from 21 to 28 ounces avoirdupois. Origin: LL. Trona, fr. L. Trutina a balance; cf. Gr. Source: Websters Dictionary (01 Mar 1998)