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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 study Samples and examplesGeology - general words
(Definition of core noun (CENTRE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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