Here's how it evolved:
1. Nucleus: This Latin word, meaning "kernel" or "nut," was used to refer to the central part of a seed or fruit.
2. Nucleus (in biology): In the 19th century, biologists adopted the term "nucleus" to refer to the central, dense body within a cell, which contains the cell's genetic material.
3. Nuclear (physics): In the early 20th century, physicists discovered the atomic nucleus, the tiny, dense core of an atom containing protons and neutrons. They adapted the term "nuclear" to describe this subatomic structure.
4. Nuclear (general usage): The term "nuclear" has since expanded to encompass anything related to atomic nuclei, including nuclear energy, nuclear weapons, and nuclear medicine.
So, the word "nuclear" ultimately comes from the Latin word nucleus, reflecting the core or central part of something, whether it be a seed, a cell, or an atom.