amber · electron
fossilized tree resin
Today this word meansA gem formed from hardened tree resin.
The Greek word for amber is ēlektron. Ovid wrote that it was the hardened tears of Phaethon's sisters.
Rub amber on cloth and it picks up dust; in 1600 Gilbert named that force electricus.
Electric and electron both flow from here — the etymology of electricity is a gemstone.
Worth noting
The English word amber itself is not Greek but Arabic — ʿanbar, meaning ambergris. One substance ended up with names from two different roads.