avoirdupois weight

avoirdupois weight

noun
a system of weight measurement based on a pound of 16 ounces or 7,000 grains, in wide use in English-speaking countries; the system is used for goods other than gems, precious metals, and drugs: 2711/32 grains = 1 dram; 16 drams = 1 ounce; 16 ounces = 1 pound; 112 pounds (Brit.) or 100 pounds (U.S.) = 1 hundredweight; 20 hundredweight = 1 ton. The pound contains 7000 grains. Abbreviation: av.; avdp.; avoir.

Origin:
1610–20

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World English Dictionary
avoirdupois or avoirdupois weight (ˌævədəˈpɔɪz, ˌævwɑːdjuːˈpwɑː, ˌævədəˈpɔɪz, ˌævwɑːdjuːˈpwɑː)
 
n
avdp, Abbreviation: avoir a system of weights used in many English-speaking countries. It is based on the pound, which contains 16 ounces or 7000 grains. 100 pounds (US) or 112 pounds (Brit) is equal to 1 hundredweight and 20 hundredweights equals 1 ton
 
[C14: from Old French aver de peis goods of weight]
 
avoirdupois weight or avoirdupois weight
 
n
 
[C14: from Old French aver de peis goods of weight]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

avoirdupois weight n.
A system of weights and measures based on a pound containing 16 ounces or 7,000 grains and equal to 453.59 grams.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
avoirdupois weight   (āv'ər-də-poiz')  Pronunciation Key 
A system of weights and measures based on a pound containing 16 ounces or 7,000 grains, and equal to 453.59 grams. Avoirdupois weight is used in the United States to weigh everything except gems, precious metals, and drugs. Compare troy weight.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

avoirdupois weight

traditional system of weight in the British Imperial System and the United States Customary System of weights and measures. The name derives ultimately from French avoir de pois ("goods of weight" or "property"). The avoirdupois pound contains 7,000 grains, or 256 drams of 27.344 grains each, or 16 ounces of 437 12 grains each. It is used for all products not subject to apothecaries' weight (for pharmaceutical items) or troy weight (for precious metals). It is equal to about 1.22 apothecaries' or troy pounds. Since 1959 the avoirdupois pound has been officially defined in most English-speaking countries as 0.45359237 kg.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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