S: (n) conductor (a device designed to transmit electricity, heat, etc.)
S: (n) busbar, bus (an electrical conductor that makes a common connection between several circuits) "the busbar in this computer can transmit data either way between any two components of the system"
S: (n) electrode (a conductor used to make electrical contact with some part of a circuit)
S: (n) heat sink (a metal conductor specially designed to conduct (and radiate) heat)
S: (n) lightning rod, lightning conductor (a metallic conductor that is attached to a high point and leads to the ground; protects the building from destruction by lightning)