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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·to′ri·al (kŏn′dŭk-tôr′ē-əl) adj.
relating to a conductor