A unit of mass in the Apothecaries' system of weights equal to 8 apdrams or 480 apgrains, and equivalent to 31.103 grams.
Apothecaries' System of Weights, Apdram, Apgrain
References
Woolf, H. B. (Ed. in Chief). Webster's New Collegiate Dictionary. Springfield, MA: Merriam, p. 1329, 1980.
