kernel

Noun
  1. The inner and usually edible part of a seed or grain or nut or fruit stone (synset 113157787)
    "black walnut kernels are difficult to get out of the shell"
  2. A single whole grain of a cereal (synset 112177573)
    "a kernel of corn"
  3. The choicest or most essential or most vital part of some idea or experience (synset 105929717)
    "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"

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