/ Dictionary / Index B binary star: Meaning and Definition of Find definitions for: bi'nary star' Pronunciation: [key] — Astron. Astron. a system of two stars that revolve about their common center of mass. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. binary pulsar binary system Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language