Princeton's WordNet

1. kernel, meat(noun)

   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"

2. kernel(noun)

   a single whole grain of a cereal

   "a kernel of corn"

3. kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty(noun)

   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"

Wiktionary

1. kernel(Noun)

   The core, center, or essence of an object or system.

2. kernel(Noun)

   The central (usually edible) part of a nut, especially once the hard shell has been removed.

3. kernel(Noun)

   A single seed or grain, especially of corn or wheat.

4. kernel(Noun)

   The central part of many computer operating systems which manages the system's resources and the communication between hardware and software components.

5. kernel(Noun)

   The stone of certain fruits, such as peaches or plums.

6. kernel(Noun)

   Those elements, in the domain of a function, which the function maps to zero.

   If a function is continuous then its kernel is a closed set.

7. kernel(Noun)

   The set of members of a fuzzy set which are fully included (i.e., whose grade of membership is 1).

Origin: From cyrnel, diminutive of corn, related to kjarni

Webster Dictionary

1. Kernel(noun)

   the essential part of a seed; all that is within the seed walls; the edible substance contained in the shell of a nut; hence, anything included in a shell, husk, or integument; as, the kernel of a nut. See Illust. of Endocarp

2. Kernel(noun)

   a single seed or grain; as, a kernel of corn

3. Kernel(noun)

   a small mass around which other matter is concreted; a nucleus; a concretion or hard lump in the flesh

4. Kernel(noun)

   the central, substantial or essential part of anything; the gist; the core; as, the kernel of an argument

5. Kernel(verb)

   to harden or ripen into kernels; to produce kernels

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