Troy weight [pondus Troj', Lat.], a weight of twelve Troy ounces to the pound, having its name from Troyes, a city in Aube, France.
Under the Weights and Measures Act, 1878 (41 & 42 Vict. c. 49), s. 20, precious metals (gold, silver, platinum and other precious metals), and gold and silver lace and precious stones may be sold by the ounce Troy of 480 grains (see Third Sch.); and all other articles must be sold by avoirdupois weight of 437.5 grains to the ounce avoirdupois, the metric equivalents for the respective ounces being 31.103496 grams (Troy), and 28.34954 grams (avoirdupois). The pound Troy does not seem to be referred to by statute. Drugs may be sold by apothecaries weight.