avoirdupois

 /ˌævədəˈpɔɪz/

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WordReference Random House Learner's Dictionary of American English © 2016
av•oir•du•pois /ˌævɚdəˈpɔɪz/USA pronunciation   n. [uncountable]
  1. Weights and Measuresthe system of weights, based on the pound of 16 ounces, used in Great Britain and the U.S.:The ton of 2,000 pounds is an avoirdupois measurement.[used after a measurement]16 ounces avoirdupois.Abbr.: av.;
    avdp.;
    avoir.

WordReference Random House Unabridged Dictionary of American English © 2016
av•oir•du•pois  (av′ər də poiz),USA pronunciation n. 
  1. Weights and MeasuresSee  avoirdupois weight. 
  2. Informal Termsbodily weight:He carries around a lot of excess avoirdupois.
  • Latin pēnsum)
  • Latin ) + pois (earlier peis
  • Latin habēre to have) + de (
  • Old French, equivalent. to avoir (earlier aveir
  • Middle English avoir de pois literally, property of weight 1250–1300


Collins Concise English Dictionary © HarperCollins Publishers::

avoirdupois, avoirdupois weight /ˌævədəˈpɔɪz; ˌævwɑːdjuːˈpwɑː/ n
  1. 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
Etymology: 14th Century: from Old French aver de peis goods of weight



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