a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
the chamber of a nuclear reactor containing the fissile material where the reaction takes place
(computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories; "each core has three wires passing through it, providing the means to select and detect the contents of each bit" 同义词:magnetic core,