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  Dictionary Definition of core

core
noun, verb, cored, coring.

-- noun
1. the central part of a fleshy fruit, containing the seeds.
2. the central, innermost, or most essential part of anything: the core of a curriculum.
3. Electricity a. the piece of iron, bundle of iron wires, or the like, forming the central or inner portion of an electromagnet, induction coil, or the like. b. the armature core of a dynamo machine, consisting of the assembled armature laminations without the slot insulation or windings.
4. Computers a. a small ferrite ring formerly used to store a binary digit of information by induced magnetism. b. core store.
5. Foundry a body of sand, usually dry, placed in a mould to form openings to give shape to a casting.
6. a cylinder of rock, soil, etc., cut out by boring.
7. the inside wood of a tree.
8. the base to which veneer woods are attached, usually of a soft or inexpensive wood.
9. Physics the inner part of a nuclear reactor consisting of the fuel and the moderator.
10. Geology the central mass of the earth, which is surrounded by the mantle, and is generally thought to consist of nickel iron; the outer portion of the core is probably liquid, the inner portion solid.
11. Also, core hole. Building Trades the hole in a masonry unit designed for pipes, etc.
-- verb (t)
12. to remove the core of (fruit).
13. to cut from the central part.
14. Building Trades to make a core in, as in masonry.
[ME; origin unknown]
-- coreless, adjective