how much fluid does a dram hold
a unit of weight which, in the apothecaries' system, equals 60 grains, or âounce; in the avoirdupois system it equals 27.34 grains, or Â¹âââounce. 1  fluid dram (fl dr) a unit of capacity (liquid measure) of the apothecaries' system, being 60 minims, or the equivalent of 3.697 mL. In Great Britain, it is the imperial fluid dram and is equivalent to 3.55 mL. See also Table of Weights and Measures in the Appendix.