from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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
from the GNU version of the Collaborative International Dictionary of English
- n. the weight which gold and silver, jewels, and the like, are weighed. It was so named from Troyes, in France, where it was first adopted in Europe. The troy ounce is supposed to have been brought from Cairo during the crusades. In this weight the pound is divided into 12 ounces, the ounce into 20 pennyweights, and the pennyweight into 24 grains; hence, the troy ounce contains 480 grains, and the troy pound contains 5760 grains. The avoirdupois pound contains 7000 troy grains; so that 175 pounds troy equal 144 pounds avoirdupois, or 1 pound troy = 0.82286 of a pound avoirdupois, and 1 ounce troy = 117/175 or 1.09714 ounce avoirdupois. Troy weight when divided, the pound into 12 ounces, the ounce into 8 drams, the dram into 3 scruples, and the scruple into 20 grains, is called apothecaries' weight, used in weighing medicines, etc. In the standard weights of the United States, the troy ounce is divided decimally down to the 1/10000 part.
from The Century Dictionary and Cyclopedia
- n. A weight chiefly used in weighing bread, silk, gold, silver, and articles of jewelry, but now only for gold and silver.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains
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