Arcturus
[ ahrk-toor-uhs, -tyoor- ]
/ ɑrkˈtʊər əs, -ˈtyʊər- /
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noun Astronomy.
a first-magnitude star in the constellation Boötes.
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Origin of Arcturus
1352–75; <Latin <Greek Arktoûros, equivalent to árkt(os) bear + -oûros keeper; replacing Middle English arture<Middle French
OTHER WORDS FROM Arcturus
Arc·tu·ri·an, adjectiveWords nearby Arcturus
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for Arcturus
British Dictionary definitions for Arcturus
Arcturus
/ (ɑːkˈtjʊərəs) /
noun
the brightest star in the constellation Boötes: a red giant. Visual magnitude: –0.4; spectral type: K2III; distance: 37 light years
Derived forms of Arcturus
Arcturian, adjectiveWord Origin for Arcturus
C14: from Latin, from Greek Arktouros, from arktos bear + ouros guard, keeper
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Scientific definitions for Arcturus
Arcturus
[ ärk-tur′əs ]
A giant star in the constellation Boötes. It is the brightest star in the Northern Hemisphere and the fourth brightest star in the sky, with an apparent magnitude of 0.00. Scientific name: Alpha Boötes.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.