ocean

Picture the ancient Greeks looking at a map that showed little more than Europe, Asia, and Africa: beyond those familiar shores, they imagined a vast river flowing around the edge of the world. They called it Ὠκεανός, Ōkeanós, and personified it as Oceanus, a god who was the son of Uranus and Gaia and the husband of Tethys. The name traveled through Latin Ōceanus and Old French occean before arriving in English around 1300; for centuries, people commonly said “ocean sea,” as though the unfamiliar loanword needed a native escort. Its ultimate origin is uncertain—some linguists consider it Pre-Greek—so the word carries a small mystery at its deepest point. By about 1650, “ocean” had shed its verbal life jacket and could stand alone, naming both Earth’s vast salt-water realm and any seemingly limitless expanse.