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core

noun
  1. a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
  2. the chamber of a nuclear reactor containing the fissile material where the reaction takes place
  3. (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data
    magnetic core
  4. the choicest or most essential or most vital part of some idea or experience
    substance
  5. the central meaning or theme of a speech or literary work
    burdenessenceeffectgist
  6. a small group of indispensable persons or things
    “five periodicals make up the core of their publishing program”
    nucleuscore group
  7. the center of an object
    “the ball has a titanium core”
  8. the central part of the Earth
  9. a cylindrical sample of soil or rock obtained with a hollow drill
verb
  1. to remove the core or center from
    “core an apple”