Core

noun (1)

1. a central and often foundational part usually distinct from the enveloping part by a difference in nature
2. such as
3. a mass of iron serving to concentrate and intensify the magnetic field resulting from a current in a surrounding coil
4. the central part of a celestial body (such as the earth or sun) usually having different physical properties from the surrounding parts
5. a nodule of stone (such as flint or obsidian) from which flakes have been struck for making implements
6. the conducting wire with its insulation in an electric cable
7. a basic, essential, or enduring part (as of an individual, a class, or an entity)
8. the essential meaning : gist
9. the inmost or most intimate part
10. a part (such as a thin cylinder of material) removed from the interior of a mass especially to determine composition
11. the usually inedible central part of some fruits (such as a pineapple)
12. the papery or leathery carpels composing the ripened ovary in a pome fruit (such as an apple)especially
13. the muscles of the mid-region of the torso
14. the place in a nuclear reactor where fission (see fission entry 1 sense 3) occurs
15. an arrangement of a course of studies that combines under basic topics material from subjects conventionally separated and aims to provide a common background for all students
16. the portion of a foundry mold that shapes the interior of a hollow casting
17. a vertical space (as for elevator shafts, stairways, or plumbing apparatus) in a multistory building
18. a computer memory consisting of an array of cores strung on fine wires
19. the internal memory of a computerbroadly
20. a tiny doughnut-shaped piece of magnetic material (such as ferrite) used in computer memories