/ Dictionary / Index A A star: Meaning and Definition of Find definitions for: A star Pronunciation: [key] — Astron. Astron. a blue to white star, as Altair, Sirius, or Vega, having a surface temperature between 7500 and 10,000 K and an absorption spectrum dominated by Balmer-series lines of hydrogen. Cf. spectral type. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Astaire astarboard Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language