conductor

conductor
    n 1: the person who leads a musical group [syn: {conductor},
         {music director}, {director}]
    2: a substance that readily conducts e.g. electricity and heat
       [ant: {dielectric}, {insulator}, {nonconductor}]
    3: the person who collects fares on a public conveyance
    4: a device designed to transmit electricity, heat, etc.
    

Conductor \Con*duct"or\ (k[o^]n*d[u^]k"t[~e]r), n. [LL., a
   carrier, transporter, L., a lessee.]
   1. One who, or that which, conducts; a leader; a commander; a
      guide; a manager; a director.
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            Zeal, the blind conductor of the will. --Dryden.
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   2. One in charge of a public conveyance, as of a railroad
      train or a street car. [U. S.]
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   3. (Mus.) The leader or director of an orchestra or chorus.
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   4. (Physics) A substance or body capable of being a medium
      for the transmission of certain forces, esp. heat or
      electricity; specifically, a lightning rod.
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   5. (Surg.) A grooved sound or staff used for directing
      instruments, as lithontriptic forceps, etc.; a director.
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   6. (Arch.) Same as {Leader}.
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   {Prime conductor} (Elec.), the largest conductor of an
      electrical machine, serving to collect, accumulate, or
      retain the electricity.
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107 Moby Thesaurus words for "conductor":
      Kapellmeister, Mahdi, administrator, agent, baggage man, bakehead,
      band leader, band major, bandmaster, bell cow, bell mare,
      bellwether, bodyguard, born leader, brakeman, brakie, butcher,
      cavalier, chaperon, charismatic leader, choirmaster, choragus,
      companion, conductance, conduction, conductivity, convoy,
      coryphaeus, deputy, dielectric, directeur, director, dispatcher,
      driver, drum major, duce, duenna, electric conduction, engineer,
      escort, esquire, fellow traveler, file leader, fireman,
      footplate man, forerunner, fugleman, functionary, gas conduction,
      governor, guard, handler, impresario, inspired leader, insulator,
      intendant, ionic conduction, leader, leader of men, lineman,
      liquid conduction, manager, manipulator, messiah,
      metallic conduction, mho, nonconductor, operant, operative,
      operator, orchestra leader, pacemaker, pacesetter, photoconduction,
      pilot, porter, precentor, producer, railroad man, railroader,
      rector, redcap, responsible person, ringleader, runner,
      safe-conduct, semiconductor, shepherd, smoke agent, squire,
      standard-bearer, stationmaster, steersman, stoker, supercargo,
      superconductivity, superconductor, swain, switchman,
      symphonic conductor, torchbearer, trainboy, trainman, trainmaster,
      usher, yardman, yardmaster