#mass_unit  a unit of measurement for mass
  supertype:  #unit_of_measurement  #mass (pm)
  subtype:  #atomic_mass_unit  unit of mass for expressing masses of atoms or molecules
  subtype:  #mass_number__nucleon_number__nucleonnumber  the sum of the number of neutrons and protons in an atomic nucleus
  subtype:  #avoirdupois_unit__avoirdupoisunit  any of the units of the avoirdupois system of weights
     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
  subtype:  #metric_weight_unit__weight_unit  a decimal unit of weight based on the gram
     subtype:  #microgram__mcg  one millionth of a gram
     subtype:  #milligram__mg  1/1000 gram
     subtype:  #metric_grain__grain  used for pearls or diamonds: 50 mg or 1/4 carat
     subtype:  #decigram__dg  1/10 gram
     subtype:  #carat  a unit of weight for precious stones = 200 mg
     subtype:  #gram__gramme__gm__g  a metric unit of weight equal to one thousandth of a kilogram
     subtype:  #gram_atom__gram-atomic_weight  the quantity of an element whose weight in grams is numerically equal to the atomic weight of the element
     subtype:  #gram_molecule__mole__mol  the molecular weight of a substance expressed in grams; the basic unit of amount of substance adopted under the System International d'Unites
     subtype:  #dekagram__decagram__dkg__dag  10 grams
     subtype:  #hectogram__hg  100 grams
     subtype:  #kilogram__kg__kilo__key  one thousand grams; the basic unit of mass adopted under the System International d'Unites; "a kilogram is approximately 2.2 pounds"; "they were carrying two keys of heroin"
     subtype:  #myriagram__myg  one ten thousandth of a centner
     subtype:  #centner  in some European countries: a unit of weight equivalent to 50 kilograms
     subtype:  #metric_hundredweight__hundredweight__doppelzentner__centner  a unit of weight equal to 100 kilograms
     subtype:  #quintal  a unit of weight equal to 100 kilograms
     subtype:  #metric_ton__MT__tonne__t  a unit of weight equivalent to 1000 kilograms

3 statements are about indirect instances of #mass_unit: pm#graph1_on_animal, pm#graph1_on_spamOnly@phmartin.info, dg#graph1_on_daniel.goodburn@dsto.defence.gov.au
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