Definition of 'kernel'

Noun

1. the inner and usually edible part of a seed or grain or nut or fruit stone; "black walnut kernels are difficult to get out of the shell"
      Synonyms: meat
2. a single whole grain of a cereal; "a kernel of corn"
3. the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
      Synonyms: substance core center essence gist heart heart and soul inwardness marrow meat nub pith sum nitty-gritty

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