[1] : The Collaborative International Dictionary of English v.0.48

ohm \ohm\ =om, n. so called from the german electrician, g.
   s. ohm. elec.
   the standard unit in the measure of electrical resistance,
   being the resistance of a circuit in which a potential
   difference of one volt produces a current of one amp'ere.
   as defined by the international electrical congress in 1893,
   and by united states statute, it is a resistance
   substantially equal to 10^9 units of resistance of the c.
   g. s. system of electro-magnetic units, and is represented by
   the resistance offered to an unvarying electric current by a
   column of mercury at the temperature of melting ice 14.4521
   grams in mass, of a constant cross-sectional area, and of the
   length of 106.3 centimeters. as thus defined it is called the
   international ohm.
   1913 webster

   ohm's law elec., the statement of the fact that the
      strength or intensity of an electrical current is directly
      proportional to the electro-motive force, and inversely
      proportional to the resistance of the circuit.
      1913 webster
see also:
9 international ohm ohm's law 

[2] : WordNet (r) 2.0

ohm's law
     n : electric current is directly proportional to voltage and
         inversely proportional to resistance; i = e/r

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