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Arcturus
[ ahrk-toor-uhs, -tyoor- ]
noun
, Astronomy.
- a first-magnitude star in the constellation Boötes.
Arcturus
/ ɑːkˈtjʊərəs /
noun
- the brightest star in the constellation Boötes: a red giant. Visual magnitude: –0.4; spectral type: K2III; distance: 37 light years
Arcturus
/ ärk-tr′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.
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Derived Forms
- Arcˈturian, adjective
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Other Words From
- Arc·turi·an adjective
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Word History and Origins
Origin of Arcturus1
1352–75; < Latin < Greek Arktoûros, equivalent to árkt ( os ) bear + -oûros keeper; replacing Middle English arture < Middle French
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Word History and Origins
Origin of Arcturus1
C14: from Latin, from Greek Arktouros, from arktos bear + ouros guard, keeper
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Example Sentences
But a moment later he referred to the stupendous fact of Arcturus being fifty thousand times as big as the sun.
From Project Gutenberg
If the axis of the earth pointed toward Arcturus instead of Polaris, would the seasons be any different from what they are now?
From Project Gutenberg
Arcturus has been moving ever since the time of Job at the rate of probably more than 200 miles per second—possibly 300 miles.
From Project Gutenberg
Papilio Arcturus and some allied species, are of a golden-green, changing to blue, or to glowing purple.
From Project Gutenberg
Years ago, Arcturus and myself met a gentleman from China who knew the language.
From Project Gutenberg
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