| core | (noun) a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil | - |
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| (noun) the chamber of a nuclear reactor containing the fissile material where the reaction takes place | - |
| (noun) (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories | Synonyms: magnetic core |
| (noun) the choicest or most essential or most vital part of some idea or experience | Synonyms: center, centre, essence, gist, heart, heart and soul, inwardness, kernel, marrow, meat, nitty-gritty, nub, pith, substance, sum |
| (noun) the central meaning or theme of a speech or literary work | Synonyms: burden, effect, essence, gist |
| (noun) a small group of indispensable persons or things | Synonyms: core group, nucleus |
| (noun) the center of an object | - |
| (noun) the central part of the Earth | - |
| (noun) a cylindrical sample of soil or rock obtained with a hollow drill | - |
| (verb) remove the core or center from | - |
| coreference | (noun) the grammatical relation between two words that have a common referent | - |
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| coreferent | (adjective) related by sharing a symbolic link to a concrete object or an abstraction | - |
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| coreferential | (adjective) relating to coreference | Synonyms: co-referent |
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| coreid | (noun) a true bug | Synonyms: coreid bug |
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| coreligionist | (noun) someone having the same religion as another person | - |
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| coreopsis | (noun) any of numerous plants of the genus Coreopsis having a profusion of showy usually yellow daisylike flowers over long periods; North and South America | Synonyms: tick-weed, tickseed, tickweed |
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| corer | (noun) a device for removing the core from apples | - |
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| corespondent | (noun) the codefendant charged with adultery with the estranged spouse in a divorce proceeding | Synonyms: co-respondent |
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