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Arcturus

Syllabification: (Arc·tu·rus)
Pronunciation: /ärkˈt(y)o͝orəs/

Astronomy
Definition of Arcturus
  • the fourth brightest star in the sky, and the brightest in the constellation Boötes. It is an orange giant.

Origin:

from Greek arktos 'bear' + ouros 'guardian' (because of its position in line with the tail of Ursa Major)

Arcturus in other Oxford dictionaries

Definition of Arcturus in the British & World English dictionary