Arcturus

n. brightest star in the northern constellation Bootes, 4th brightest star in the sky

Arcturus (α Boo / α Boötis / Alpha Boötis) is the brightest star in the constellation Boötes, and the third brightest star in the night sky, with a visual magnitude of −0.05, after Sirius and Canopus, although it is fainter than the combined light of the two main components of Alpha Centauri, which are too close together for the eye to resolve as separate sources of light, making Arcturus appear to be the fourth brightest. It is the second brightest star visible from northern latitudes and the brightest star in the northern celestial hemisphere. The star is in the Local Interstellar Cloud.
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Noun
1. the 4th brightest star and the brightest star in the constellation Bootes; 36 light-years from Earth
(hypernym) giant star, giant
(member-holonym) Bootes

(n.)
A fixed star of the first magnitude in the constellation Bootes.
  

Arcturus Brilliant golden-yellow star, alpha in the constellation Bootes, seen in the summer sky, rising 50 days after the winter solstice. Known to the Chaldeans as Papsukal, guardian messenger, deity of their tenth month; to the Hindus as Nishtya (outcast); to the Arabs as Al Haris al Sama (keeper of heaven). It was regarded by sailors and farmers as a stormy star in its rising an setting, and Hippocrates held that all diseases became more critical after its rising. It is held that references to Arcturus in Job are mistranslations of allusions to the Great Bear. (Funk & Wagnalls Folklore) {SD 1:647-8; FSO 206}.