west▪ Engl ocean, »(c. 1300) occean, ‘the vast body of water on the surface of the globe’, from oFr occean ‘ocean’ (C12, modFr océan), from Lat oceanus, from Grk ōkeanos, the great river or sea surrounding the disk of the Earth (as opposed to the Mediterranean), a word of unknown origin; Beekes suggests it is pre-Grk. Personified as Oceanus, son of Uranus and Gaia and husband of Tethys« – etymonline.com.
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