#grain.troy_unit  1/60 dram; equals an avoirdupois grain or 64.799 milligrams
  supertype:  #troy_unit  #apothecaries'_unit
  part of:  #scruple.apothecaries'_unit  a unit of apothecary weight equal to 20 grains
     part of:  #dram.apothecaries'_unit__drachm__drachma  a unit of apothecary weight equal to an eighth of an ounce or to 60 grains
        part of:  #apothecaries'_ounce__apothecaries'ounce__ounce__troyounce  a unit of apothecary weight equal to 480 grains or one twelfth of a pound
           part of:  #troy_pound__apothecaries'_pound__apothecaries'pound  an apothecary weight equal to 12 ounces or 373.242 grams
  part of:  #pennyweight  a unit of apothecary weight equal to 24 grains
     part of:  #apothecaries'_ounce__apothecaries'ounce__ounce__troyounce  a unit of apothecary weight equal to 480 grains or one twelfth of a pound

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