Definition of troy weight in English English dictionary
a system of units of weight / mass, mostly used for precious metals and gemstones, in which the pound contains 12 ounces which each contain 480 grains
A system of units of weight in which the grain is the same as in the avoirdupois system and the pound contains 12 ounces, 240 pennyweights, or 5,760 grains. a system of measuring weights in Britain and the US, used especially for weighing gold, silver etc (Troyes city in northern France)