/ Dictionary / Index A astron.: Meaning and Definition of Find definitions for: astron. Pronunciation: [key] astronomer. astronomical. astronomy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. astrometry astronaut Related Content Daily Word Quiz: boorish Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language