DRACHM

There are two drachms in our system of weights; namely^ the avoirdupois dracJim, which is the sixteenth part of the avoirdupois ounce; and the apothecaries' drachm, which is the twelfth part of the troy ounce, and equivalent to sixty troy gr,iins: the latter drachm is the only one which is retained in common use. [s. 373]