/ Dictionary / Index B Beta Crucis: Meaning and Definition of Find definitions for: Be'ta Cru'cis Pronunciation: [key] a star of the first magnitude in the constellation Southern Cross. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. beta coefficient beta decay Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language