/ Dictionary / Index A astronomer: Meaning and Definition of Find definitions for: as•tron•o•mer Pronunciation: (u-stron'u-mur), [key] — n. an expert in astronomy; a scientific observer of the celestial bodies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astronomer (Thesaurus) astronavigation Astronomer Royal Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language