atom

The Greeks had a wonderfully blunt way of imagining matter: if you kept cutting something in half, you might eventually hit a bit that refused the knife. That’s what ἄτομος meant in the old philosophical debates of Leucippus and Democritus—literally “uncut.” Latin picked it up as atomus, and then English borrowed it through French, like a fancy idea arriving in a slightly rumpled coat. Fast-forward to 1805, when John Dalton gave the word fresh scientific life and made those philosophical specks into the serious business of chemistry. Then in 1945, atom took on a much darker modern glow in “atom bomb,” and suddenly the tiniest word in the room could shake a city.