Troy-weight

troy weight

noun
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.

Origin:
1425–75; late Middle English

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World English Dictionary
troy weight or troy (trɔɪ)
 
n
a system of weights used for precious metals and gemstones, based on the grain, which is identical to the avoirdupois grain. 24 grains = 1 pennyweight; 20 pennyweights = 1 (troy) ounce; 12 ounces = 1 (troy) pound
 
[C14: named after the city of Troyes, France, where it was first used]
 
troy or troy
 
n
 
[C14: named after the city of Troyes, France, where it was first used]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
troy weight   (troi)  Pronunciation Key 
A system of weights and measures in which the grain is the same as in the avoirdupois system, and a pound contains 12 ounces, or 5,760 grains. Troy weight is used primarily by miners and gold dealers. Compare avoirdupois weight.
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