Arcturus

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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.

[Middle English, from Latin Arctūrus, from Greek Arktouros : arktos, bear; see r̥tko- in Indo-European roots + ouros, guard (from its position behind Ursa Major); see wer- in Indo-European roots.]
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; < Middle French < Latin < Greek 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:
Noun1.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.
Translations
Arcturus
Arcturus
References in periodicals archive ?
One of my favorite stars is Arcturus (Alpha Bootis), which joins the fun just after midnight.
Arcturus (Alpha Bootis) is of mag -0.04--marginally brighter than Vega in Lyra--and is also one of the most highly-coloured stars.
Just after dark on June 11th that year, I saw six meteors within 15 minutes with a common radiant between Alkaid (Eta Ursae Majoris) and Arcturus (Alpha Bootis).