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English definition of “core”

core

noun (CENTRE)    /kɔːr/ US  /kɔːr/
C2 [C] the hard central part of some fruits, such as apples, which contains the seeds: Don't throw your apple core on the floor!Fruits and seeds and their partsCentres of objects [C] the centre of a planet: The Earth's core is a hot, molten mix of iron and nickel.Centres of objectsAstronomy - general words [C] specialized physics The core of a nuclear reactor (= a device in which atoms are changed to produce energy) is the place where fission (= the dividing of atoms) happens.Generating and pumping devices [C] specialized geology a long, thin cylinder-shaped mass of material taken out of the Earth for studySamples and examplesGeology - general words
(Definition of core noun (CENTRE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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