av·oir·du·pois

[av-er-duh-poiz]
noun
2.
Informal. bodily weight: He carries around a lot of excess avoirdupois.

Origin:
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) [Click for IPA pronunciation guide]
 
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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00:10
Avoirdupois is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
Etymonline
Word Origin & History

avoirdupois
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')
n.
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
Net weight shall be expressed in metric as well as avoirdupois units.
The net weight must be expressed in metric as well as avoirdupois units.
Above weights of food are net in avoirdupois ounces.
It is acceptable to state the net weight in metric weight in addition to the avoirdupois weight.
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