kernel

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

The usually edible seed inside the hard covering of a nut or fruit stone.

The central or most important part; the core.

A small amount of something, especially when potentially developing into something else.

To harden or ripen into kernels, as the seeds of plants.

An enlarged lymphatic gland.

In metallurgy, a nucleus of a double sulphid of copper and iron obtained in roasting cupriferous iron pyrites. The kernels are separated by hand from the lumps of pyrites and are melted for copper.

To crenelate.

The edible substance contained in the shell of a nut or the stone of a fruit.