#dram  1/16 ounce or 1.771 grams
  supertype:  #avoirdupois_unit__avoirdupoisunit  any of the units of the avoirdupois system of weights
  part of:  #ounce
  part:  #grain.avoirdupois_unit  1/7000 pound; equals a troy grain or 64.799 milligrams

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