kernel

kernel is a Noun

Definition:

[1] 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. ` A were as good crack a fusty nut with no kernel Shak.

[2] A single seed or grain; as, a kernel of corn.

[3] A small mass around which other matter is concreted; a nucleus; a concretion or hard lump in the flesh.

[4] The central, substantial or essential part of anything; the gist; the core; as, the kernel of an argument.