#atomic_weight__relative_atomic_mass  (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12
  supertype:  #mass  the property of a body that causes it to have weight in a gravitational field
  subtype:  #equivalent_weight__equivalent__combining_weight__combiningweight__eq  the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen
  subtype:  #milliequivalent  one-thousandth of an equivalent

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