Breadcrumb Home > Dictionary > Index A Arcturus: Meaning and Definition of Find definitions for: Arc•tu•rus Pronunciation: (ärk-toor'us, -tyoor'-), [key] — n. Astron. a first-magnitude star in the constellation Boötes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arcturus (Thesaurus) arctophile arcuate TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: parallax Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language