1. A unit of apothecary weight equal to an eighth of an ounce or to 60 grains
   "The herbalist added a drachm of dried lavender to the mixture";
   - dram, drachma
    
2. A British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimetres
   "The pharmacist measured out one fluid drachm of the tincture";
   - fluidram, fluid dram, fluid drachm
    
3. A unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce
   "The old prescription specified the dosage in fluid drachms";
   - fluidram, fluid dram, fluid drachm

Derived forms: drachms

Type of: apothecaries' unit, apothecaries' weight, British capacity unit, Imperial capacity unit, United States liquid unit

Part of: apothecaries' ounce, fl. oz., fluid ounce, fluidounce, ounce, troy ounce

Encyclopedia: Drachm