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a first-magnitude star in the constellation Boötes.
Historical Examples

It was a gentle dig at his arcturian homeland, which was smaller than most planets.
Youth Isaac Asimov

For twenty-four hours on that arcturian planet, I would give my life.
A Voyage to Arcturus David Lindsay

They are of a spectral type approximately solar; no Orion, Sirian or arcturian stars having been found among them.
Astronomical Curiosities J. Ellard Gore

It was forty feet long, eight wide, and eight high; the tank containing the arcturian back rays was in front, the car behind.
A Voyage to Arcturus David Lindsay

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

late 14c., bright star in the constellation Bootes (also used of the whole constellation), from Latin Arcturus, from Greek Arktouros; anciently associated with the Bear, and its name is Greek for “guardian of the bear.” See arctic; second element is from ouros “watcher, guardian, ward” (see warrant (n.)).

Arcturus in the Bible (Job ix:9 and xxxviii:32) is a mistranslation by Jerome (continued in KJV) of Hebrew ‘Ayish, which actually refers to the “bowl” of the Big Dipper. In Israel and Arabia, the seven stars of the Great Bear seem to have been a bier (the “bowl”) followed by three mourners. In the Septuagint it was translated as Pleiada, which is equally incorrect. The double nature of the great bear/wagon (see Big Dipper) has given two different names to the constellation that follows it: Arktouros “bear-ward” and bootes “the wagoner.”
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.

bear-keeper, the name given by the ancients to the brightest star in the constellation Bootes. In the Authorized Version (Job 9:9; 38:32) it is the rendering of the Hebrew word _’ash_, which probably designates the constellation the Great Bear. This word (‘ash) is supposed to be derived from an Arabic word meaning night-watcher, because the Great Bear always revolves about the pole, and to our nothern hemisphere never sets.


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