Meaning of AVOIRDUPOIS in English

AVOIRDUPOIS

n. (in full avoirdupois weight) a system of weights based on a pound of 16 ounces or 7,000 grains.

Etymology: ME f. OF aveir de peis goods of weight f. aveir f. L habere have + peis (see POISE(1))

Oxford English vocab.      Оксфордский английский словарь.