oceano-, ocean- +
(Greek > Latin: "the great river encompassing the whole earth"; hence, the "great Outward Sea" [as opposed to the "Inward" or Mediterranean]; the ocean)
Additional information at "Oceanic Sounds in a Realm of Silence".
Inter-related cross references, directly or indirectly, involving the "sea" and the "ocean" bodies of water: abysso- (bottomless); Atlantic; batho-, bathy- (depth); bentho- (deep, depth); halio-, halo- (salt or "the sea"); mare, mari- (sea); necto-, nekto- (swimming); pelago- (sea, ocean); plankto- (drifting); thalasso- (sea, ocean).
Cross references of word families that are related directly, or indirectly, to: "river, stream": amni-; fluvio-; meand-; potamo-; ripari-.