1. 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, drachm
    
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, drachm

Derived forms: fluid drachms

Type of: British capacity unit, Imperial capacity unit, United States liquid unit

Part of: fl. oz., fluid ounce, fluidounce

Encyclopedia: Fluid drachm