- The kernel of a seed is all that is within the outer coat of the seed, as the edible substance contained in the shell of a nut; hence, anything included in a shell, husk, or integument. The term kernel can also mean a single seed or grain, as "a kernel of corn".
- The kernel of an operating system is its essential component, such as the Linux kernel.
- In mathematics, kernel has several different, somewhat unrelated meanings; see kernel (mathematics), or go directly to kernel of a function, kernel (algebra), or kernel (category theory).
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