#troy_unit  any of the unit of the troy system of weights
  supertype:  #weight_unit  a unit used to measure weight; "he placed two weights in the scale pan"
  part of:  #troy_weight
  subtype:  #grain.troy_unit  1/60 dram; equals an avoirdupois grain or 64.799 milligrams
  subtype:  #pennyweight  a unit of apothecary weight equal to 24 grains
  subtype:  #apothecaries'_ounce__apothecaries'ounce__ounce__troyounce  a unit of apothecary weight equal to 480 grains or one twelfth of a pound
  subtype:  #troy_pound__apothecaries'_pound__apothecaries'pound  an apothecary weight equal to 12 ounces or 373.242 grams

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