Akademik

a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains

: a series of units of weight based on a pound of 12 ounces and the ounce of 20 pennyweights or 480 grains — see measure table

a system of weights in use for precious metals and gems (formerly also for bread, grain, etc.): 24 grains = 1 pennyweight (1.555 grams); 20 pennyweights = 1 ounce (31.103 grams); 12 ounces = 1 pound (0.373 kilogram). The grain, ounce, and pound are the same as in apothecaries' weight, the grain alone being the same as in avoirdupois weight. The troy pound is no longer a standard weight in Great Britain.

[1425-75; late ME]

troy weight UK [ˌtrɔɪ ˈweɪt] US [ˈtrɔɪ ˌweɪt] noun [uncountable]

a system for measuring the weight of jewels and metals such as gold and silver

Thesaurus: units for measuring weight, area or volume_hyponym to measure something_synonym

troy weight,

a standard system of weights used for gems and precious metals. One pound troy equals a little over four fifths of an ordinary pound. In the United States: