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.
- ↑ 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.