Home › Words › O › oceanautoceanautoceanaut means an explorer in a submarine.EtymologyFrom ocean + -naut, modelled on astronaut.nounAn explorer in a submarine.Someone who lives or does scientific work underwater.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.aquanaut 75% match — An underwater explorer. vs oceanaut →autosub 62% match — An autonomous submarine vehicle. vs oceanaut →bathyscaphe 61% match — A self-propelled deep-sea diving submersible for exploring the ocean depths, consisting of a crew cabin similar to a bathysphere suspended below a float filled with a buoyant liquid such as petrol. vs oceanaut →oceanfarer 61% match — Someone who travels on the ocean vs oceanaut →mesoscaphe 60% match — A submersible submarine designed for drifting on sea currents in the middle depth layers of the ocean. vs oceanaut →submariner 59% match — A member of the crew of a submarine. vs oceanaut →oceangoing 59% match — Travelling out to sea. vs oceanaut →hydronaut 59% match — Synonym of aquanaut. vs oceanaut →