Kernel

Part of speech: noun

Pronunciation: /ˈkɜː.nəl/

Definitions

1. The central, most essential part of something, or the edible seed inside a nut or fruit pit
2. The innermost, crucial component of a system or object is often compared to the edible part found within certain fruits or nuts
3. It refers to both the core element that is vital to understanding or functionality and the edible seed encased in a protective layer

Etymology: The word began as a little grain. Old English "cyrnel" was a diminutive of the Proto-Germanic word for seed or grain, "kurną," which is also behind modern "corn." The "-el" ending marked something small, so a kernel was literally a tiny seed or grain, the hard piece inside a husk or shell. That literal sense is still visible in everyday use. A nut's edible inner part, a seed inside a fruit stone, and a grain of wheat are all kernels. The Middle English form "kirnel" kept the same meaning, and the word's Germanic relatives, such as Middle Dutch "kernel" and Yiddish "kerndl," kept it close to the seed sense too. The leap to the modern figurative sense, the essential core of something, grew naturally from that picture. A kernel is the part that matters once the outer covering is stripped away, which is why the same word now names the central idea of an argument or the heart of a computer operating system.

Synonyms: seed, grain, nucleus, core, heart

Antonyms: whole, exterior, surface, shell, outer layer