con·duc·tor 
(kən-dŭktər)
(kən-dŭktər)n.
1. One who conducts, especially:
a. One who is in charge of a railroad train, bus, or streetcar.
b. Music One who directs an orchestra or other such group.
2. Physics A substance or medium that conducts heat, light, sound, or especially an electric charge.
3. A lightning rod, as on a house or barn.
con′duc·tori·al (kŏn′dŭk-tôrē-əl) adj.
con·ductor·ship′ n.