Noun mv has 2 senses
  1. millivolt, mV - a unit of potential equal to one thousandth of a volt
    --1 is a kind of potential unit
    --1 is a part of volt, V
  2. mendelevium, Md, Mv, atomic number 101 - a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)
    --2 is a kind of chemical element, element
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