1) Maestro 1) Terrific orchestra leader 
A material which has no resistance to electricity. When passing current through a superconductor, there is no loss of electrical power due to these materials.
substance which, in a given direction, has zero DC resistivity and perfect diamagnetism if the temperature, the magnetic field strength and the electric current density are below certain limitsmaterial which exhibits superconductivity under appropriate conditions NOTE 1 - Often refers to electrical wire or thin films made of superconducting materials. NOTE 2 - Appropriate conditions apply to temperature, magnetic field strength and current density.
<physics> A type of electrical conductor that permits a current to flow with zero resistance. ... Without superconducting coils, a toroidal magnetic-confinement fusion reactor would not be possible, because too much energy would be required to maintain the magnetic fields against resistive energy losses in the coil conductors. ... (19 Jan 199...
It is a substance which has no electrical resistance.