\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.
         Zeal, the blind conductor of the will. --Dryden.
2. One in charge of a public conveyance, as of a railroad
   train or a street car. [U. S.]
3. (Mus.) The leader or director of an orchestra or chorus.
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.
5. (Surg.) A grooved sound or staff used for directing
   instruments, as lithontriptic forceps, etc.; a director.
6. (Arch.) Same as {Leader}.
{Prime conductor} (Elec.), the largest conductor of an
   electrical machine, serving to collect, accumulate, or
   retain the electricity.