A unit of mass in the Apothecaries' system of weights equal to 1/20 apscruple, and equivalent to 0.0648 grams.
Apothecaries' System of Weights, Apscruple
References
Woolf, H. B. (Ed. in Chief). Webster's New Collegiate Dictionary. Springfield, MA: Merriam, p. 1329, 1980.
