Conductor

Part of speech: noun (n.)

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. The leader or director of an orchestra or chorus.

4. A substance or body capable of being a medium for the transmission of certain forces, esp. heat or electricity; specifically, a lightning rod.

5. A grooved sound or staff used for directing instruments, as lithontriptic forceps, etc.; a director.

6. Same as Leader. Prime conductor (Elec.), the largest conductor of an electrical machine, serving to collect, accumulate, or retain the electricity.