kernel

noun

ker·​nel ˈkər-nᵊl 

1

: the inner softer part of a seed, fruit stone, or nut

… as brown in hue as hazelnuts, and sweeter than the kernels.

—William Shakespeare

2

: a whole seed of a cereal

a kernel of corn

3

: a central or essential part : germ

Like many stereotypes … this one too contains some kernels of truth.

—S. M. Lyman

4

chiefly dialectal : a fruit seed

5

mathematics : a subset of the elements of one set (such as a group) that a function (such as a homomorphism) maps onto an identity element of another set

Synonyms of kernel

• root
• core
• essence
• heart

Examples of kernel in a Sentence

There's not a kernel of truth in what they say.

the kernel of your argument seems to be the inevitability of human migration into space

Recent Examples on the Web

Every kernel of corn, rye, wheat, and barley that goes into a Frey Ranch whiskey is grown on the ranch, the barley malted on-site, milled, mashed, distilled, aged, and bottled within the same property. —Joseph V Micallef, Forbes.com, 13 June 2026

Onion Onions may benefit from the same outer-layer removal principle that protects sweet corn kernels. —Anna Giorgi, Verywell Health, 12 June 2026

Once kernels are slightly more tender than al dente, add slurry. —Heather Riske, Better Homes & Gardens, 12 June 2026

The kernels should feel plump and firm, and the tassel—the cluster of silks at the top of the ear—should be white or yellow. —Martha Stewart, 11 June 2026

Word History

Etymology

Middle English, from Old English cyrnel, diminutive of corn

First Known Use

before the 12th century, in the meaning defined at sense 4

Phrases Containing kernel

• pine kernel

Rhymes for kernel

• colonel
• journal
• sternal
• vernal
• diurnal
• eternal
• external
• fraternal
• infernal
• internal
• maternal
• nocturnal

Kids Definition

kernel

noun

ker·​nel ˈkərn-ᵊl 

1

a

: the inner softer part of a seed, fruit stone, or nut

b

: a whole grain or seed of a cereal (as wheat or corn)

2

: a central or basic part

a kernel of truth in what they say