Conductor

con;duc;tor pronunciation: function: noun date: 15th century : one that conducts: as a : guide b : a collector of fares in a public conveyance c : the leader of a musical ensemble d (1) : a material or object that permits an electric current to flow easily — compare insulator, semiconductor (2) : a material capable of transmitting another form of energy (as heat or sound) — con;duc;to;ri;al adjective