What Really Is Everything?
When it comes to the word Atom, we have to go to ancient Greece of 400 B.C. And there was a brilliant philosopher named Democritus, and he proposed the Greek word Atomos, which means uncuttable. And so as he explained, all matter was eventually reducible to discrete, small particles or Atomos.
Democritus Democritus was an Ancient Greek pre-Socratic philosopher primarily remembered today for his formulation of an atomic theory of the universe. Democritus was born in Abdera, Thrace, around 460 BC. Wikipedia