Definition of avoirdupois noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌævədəˈpɔɪz//
, BrE//ˌævwɑːdjuːˈpwɑː//
; NAmE NAmE//ˌævərdəˈpɔɪz//
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the system of weights based on the pound Word OriginMiddle English (denoting merchandise sold by weight): from Old French aveir de peis ‘goods of weight’, from aveir ‘to have’ (infinitive used as a noun, from Latin habere) + peis ‘weight’ from an alteration of Latin pensum ‘weight’, from the verb pendere ‘weigh’.
See the Oxford Advanced American Dictionary entry: avoirdupois