#megohm  a unit of resistance equal to one million ohms
  supertype:  #resistance_unit  the reciprocal of conductance
  part:  #ohm  a unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere
     part:  #abohm  a unit of resistance equal to a billionth of an ohm

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