Breadcrumb Home > Dictionary > Index O oceanaut: Meaning and Definition of Find definitions for: o•cea•naut Pronunciation: (ō'shu-nôt", -not"), [key] — n. aquanaut. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oceanaut (Thesaurus) oceanarium Ocean City ✖ Related Content Daily Word Quiz: musth Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language