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(computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories.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”

The central part of the Earth.

The chamber of a nuclear reactor containing the fissile material where the reaction takes place.

A small group of indispensable persons or things.

“five periodicals make up the core of their publishing program”

The central meaning or theme of a speech or literary work.

The choicest or most essential or most vital part of some idea or experience.

An organization founded by James Leonard Farmer in 1942 to work for racial equality.

A bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil.

A cylindrical sample of soil or rock obtained with a hollow drill.

The center of an object.

“the ball has a titanium core”

Remove the core or center from.

“core an apple”