Oceanus

noun

Oce·​anus ō-ˈsē-ə-nəs 

: a Titan who rules over a great river encircling the earth in Greek mythology

Word History

Etymology

Latin Ōceanus, borrowed from Greek Ōkeanós, personification of Ōkeanós "the sea flowing around the land mass of the known world" — more at ocean

First Known Use

1567, in the meaning defined above