Informal. bodily weight: He carries around a lot of excess avoirdupois.

1250–1300; Middle English avoir de pois literally, property of weight < Old French, equivalent to avoir (earlier aveir < Latin habēre to have) + de (< Latin ) + pois (earlier peis < Latin pēnsum)

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World English Dictionary
avoirdupois or avoirdupois weight (ˌævədəˈpɔɪz, ˌævwɑːdjuːˈpwɑː, ˌævədəˈpɔɪz, ˌævwɑːdjuːˈpwɑː)
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
[C14: from Old French aver de peis goods of weight]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, misspelling of M.E. avoir-de-peise (c.1300), from O.Fr. avoir de pois "goods of weight," from aveir "property, goods" (noun use of aveir "have") + peis "weight," from L. pensum, neut. of pendere "to weigh" (see pendant). After late 15c., the standard system of weights
used in England for all goods except precious metals, precious stones, and medicine.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

avoirdupois av·oir·du·pois (āv'ər-də-poiz')
Avoirdupois weight.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Above weights of food are net in avoirdupois ounces.
Net weight shall be expressed in metric as well as avoirdupois units.
It is acceptable to state the net weight in metric weight in addition to the avoirdupois weight.
The net weight must be expressed in metric as well as avoirdupois units.
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