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Arc·tu·rus

 (ärk-to͝or′əs, -tyo͝or′-)

n.

The fourth brightest star in the sky and the brightest star in the constellation Boötes, approximately 36 light years from Earth.


American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Arcturus

(ɑːkˈtjʊərəs)

n

(Celestial Objects) the brightest star in the constellation Boötes: a red giant. Visual magnitude: –0.4; spectral type: K2III; distance: 37 light years

[C14: from Latin, from Greek Arktouros, from arktos bear + ouros guard, keeper]

Arcˈturian adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Arc•tu•rus

(ɑrkˈtʊər əs, -ˈtyʊər-)

n.

a first-magnitude star in the constellation Boötes.

[1352–75; Arktoûros=árkt(os) bear (see Ursa Major) + oûros guardian]

Arc•tu′ri•an, adj.

Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Arc·tu·rus

(ärk-to͝or′əs)

The brightest star in the Northern Hemisphere. It is in the constellation Boötes.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun 1. Arcturus - the 4th brightest star and the brightest star in the constellation BootesArcturus – the 4th brightest star and the brightest star in the constellation Bootes; 36 light-years from Earth

Bootes – a constellation in the northern hemisphere near Ursa Major

Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

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