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From George Eastman House : Notes On Photographs

Literally translated from the French, avoirdupois means “goods of weight.” This system of measuring by grains was used in Great Britain and America for everything except precious metals, gems, and medicines.^[1]

1. ↑ Osterman, Mark. 2007. Avoirdupois. In The Focal Encyclopedia of Photography: Digital Imaging, Theory and Applications, History, and Science, ed. Michael R. Peres, 44, Focal Press.