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core ((computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories) "each core has three wires passing through it, providing the means to select and detect the contents of each bit"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