/ Dictionary / Index B Betelgeuse: Meaning and Definition of Find definitions for: Be•tel•geuse Pronunciation: (bēt'l-jz", bet'l-jœz"), [key] — n. Astron. a first-magnitude red supergiant in the constellation Orion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: betelgeuse (Thesaurus) betel betel nut 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