A traditional unit of weight in Scotland, equal to 1/16 Scots ounce or about 1.9 grams. Sometimes spelled drop, this unit was the Scottish counterpart of the English dram [1]
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}