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.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.