noun a single seed or grain; as, a kernel of corn.
2. kernel ·vi to harden or ripen into kernels; to produce kernels.
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 ·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.