Noun

1. A small group of indispensable persons or things
2. The center of an object
3. The central part of the earth
4. The choicest or most essential or most vital part of some idea or experience
5. A cylindrical sample of soil or rock obtained with a hollow drill
6. An organization founded by james leonard farmer in 1942 to work for racial equality
7. The central meaning or theme of a speech or literary work
8. (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories
9. The chamber of a nuclear reactor containing the fissile material where the reaction takes place
10. A bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil

Verb

1. Remove the core or center from