kernel

American  

[kur-nl] / ˈkɜr nl /

noun

1. the softer, usually edible part contained in the shell of a nut or the stone of a fruit.

2. the body of a seed within its husk or integuments.

3. a whole seed grain, as of wheat or corn.

4. South Atlantic States. the pit or seed of a peach, cherry, plum, etc.

5. the central or most important part of anything; essence; gist; core.

   His leadership is the kernel of the organization.

6. Mathematics. the set of elements that a given function from one set to a second set maps into the identity of the second set.

7. Also called rumpf.  Physical Chemistry. the remainder of an atom after the valence electrons have been removed.

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verb (used with object)

kerneled, kerneling, kernelled, kernelling

1. to enclose as a kernel.

kernel British  

/ ˈkɜːnəl /

noun

1. the edible central part of a seed, nut, or fruit within the shell or stone

2. the grain of a cereal, esp wheat, consisting of the seed in a hard husk

3. the central or essential part of something

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verb

1. rare (intr) to form kernels

kernel Scientific  

/ kûr′nəl /

1. A grain or seed, as of a cereal grass, enclosed in a husk.

2. The inner, usually edible seed of a nut or fruit stone.

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Other Word Forms

• kernel-less adjective
• kernelless adjective
• kernelly adjective

Etymology

Origin of kernel

before 1000; Middle English kirnel, Old English cyrnel, diminutive of corn seed, corn ¹

Explanation

Whether it’s the kernel of a pistachio nut or the kernel of wisdom in a story, kernel can refer to the center or essential part of something. The word kernel traces back to the Old English word cyrnel, which is related to corn. If you have ever eaten corn on the cob, you ate the kernels. Popcorn is made by heating corn kernels until they explode, or "pop." Like these examples, sometimes kernel means "a small bit" or "single piece," as in a story someone tells you that couldn't possibly have happened as described, but still has a kernel of truth about human nature.

Example Sentences

The company’s approach is to form cement into tiny balls, each about the size of a kernel of corn.

From The Wall Street Journal • Mar. 27, 2026

Malhees said in his post that the restriction “hurts” but offered his followers and supporters a kernel of truth: “You can block a passport. You cannot block a voice.”

From Los Angeles Times • Mar. 13, 2026

Is there any kernel of truth to anything she’s saying?

From Slate • Feb. 27, 2026

There’s a kernel of truth to Wyle’s fake PSA.

From Salon • Jan. 14, 2026

The husk, the fruit, and the kernel align.

From "Saints and Misfits" by S.K. Ali

Related Words

• fruit
• grain
• meat
• morsel
• nut