Meaning of KERNEL in English

[noun] [C] - the edible part of a nut that is inside the shellThe almond shells are cracked by machine and the kernels extracted.See picture: NutsA kernel can also be the whole seed of the maize plant.corn kernelsThe kernel of something is the most important part of it, although it might not always be easy to find.There is often a kernel of truth in what they say.

Cambridge English vocab.      Кембриджский английский словарь.