/ Dictionary / Index A aquanaut: Meaning and Definition of Find definitions for: aq•ua•naut Pronunciation: (ak'wu-nôt", -not", ä'kwu-), [key] — n. an undersea explorer, esp. one who skin-dives from or lives for an extended period of time in a submerged dwelling. a skin-diver. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aquanaut (Thesaurus) aquamarine aquaplane Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language