/ Dictionary / Index B beta line: Meaning and Definition of Find definitions for: be'ta line" Pronunciation: [key] — Stock Exchange. Stock Exchange. beta (def. 6). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. betake betamethasone Related Content Daily Word Quiz: laudable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language