#avoirdupois_unit__avoirdupoisunit  any of the units of the avoirdupois system of weights
  supertype:  #mass_unit  a unit of measurement for mass
  subtype:  #grain.avoirdupois_unit  #dram  #ounce  #lb  #stone.avoirdupois_unit  #quarter.avoirdupois_unit  #long_hundredweight  #short_hundredweight  #long_ton  #short_ton  #kiloton.avoirdupois_unit  #megaton.avoirdupois_unit
  part of:  #English_system__British_system  a system of weights and measures based on the foot and pound and second
  part of:  #avoirdupois_weight__avoirdupoisweight__avoirdupois__avoirdupoi  a system of weights based on the 16-ounce pound (or 7,000 grains)

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