Definition of Arcturus in English:

Arcturus

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

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Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space