Etymology

Noun

1. A body of individuals; an assemblage.
2. A miner's underground working time or shift.
3. A Hebrew dry measure; a cor or homer.
4. The central part of fruit, containing the kernels or seeds; as, the core of an apple or quince.
5. The heart or inner part of a thing, as of a column, wall, rope, of a boil, etc.
6. The center or inner part, as of an open space; as, the core of a square.
7. The most important part of a thing; the essence; as, the core of a subject.
8. The portion of a mold that creates an internal cavity within a casting or that makes a hole in or through a casting.
9. A disorder of sheep caused by worms in the liver.
10. The bony process which forms the central axis of the horns in many animals.
11. magnetic memory.
12. One of several parts in a computer processor.
13. A deposit paid by the purchaser of a rebuilt part, to be refunded on return of a used, rebuildable part, or the returned rebuildable part itself. Said to be an acronym for Cash On REturn, but that may be a backronym.

Verb

1. To remove the core (4) of an apple.
2. To extract a sample with a drill.