/ Dictionary / Index A astronaut: Meaning and Definition of Find definitions for: as•tro•naut Pronunciation: (as'tru-nôt", -not"), [key] — n. a person engaged in or trained for spaceflight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astronaut (Thesaurus) astron. astronautical Related Content Daily Word Quiz: verbose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language