#avoirdupois_unit__avoirdupoisunit  any of the units of the avoirdupois system of weights
  supertype:  #mass_unit  a unit of measurement for mass
  part of:  #English_system  #avoirdupois_weight
  subtype:  #grain.avoirdupois_unit  1/7000 pound; equals a troy grain or 64.799 milligrams
  subtype:  #dram  1/16 ounce or 1.771 grams
  subtype:  #ounce  a unit of weight equal to one sixteenth of a pound or 16 drams or 28.349 grams
  subtype:  #lb__pound  16 ounces; "he tried to lift 100 pounds"
  subtype:  #stone.avoirdupois_unit  (British) an avoirdupois unit used to measure the weight of a human body; equal to 14 pounds
  subtype:  #quarter.avoirdupois_unit  $('p' #lb removed since already part of stone.avoirdupois_unit)$ a quarter of a hundredweight (25 pounds)
  subtype:  #long_hundredweight__hundredweight__cwt  a British unit of weight equivalent to 112 pounds
  subtype:  #short_hundredweight__shorthundredweight__hundredweight__cwt__centner__quintal  a United States unit of weight equivalent to 100 pounds
  subtype:  #long_ton__ton__gross_ton__grosston  a British unit of weight equivalent to 2240 pounds
  subtype:  #short_ton__shortton__ton__net_ton__netton  a United States unit of weight equivalent to 2000 pounds
  subtype:  #kiloton.avoirdupois_unit  one thousand tons
  subtype:  #megaton.avoirdupois_unit  one million tons

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