1. the inner and usually edible part of a seed or grain or nut or fruit stone

- black walnut kernels are difficult to get out of the shell

Similar word(s): meat

Definition categories: plant

2. a single whole grain of a cereal

- a kernel of corn

Definition categories: plant, caryopsis, grain

3. the choicest or most essential or most vital part of some idea or experience

Similar word(s): center, centre, core, essence, gist, heart, inwardness, marrow, meat, nub, pith, substance, sum

Definition categories: thought, content

Sentences with kernel as a noun:

- the kernel of an argument

- The Dirichlet kernel convolved with a function yields its Fourier series approximation.

- If a function is continuous then its kernel is a closed set.