Definition of Arcturus in English:

Arcturus

proper noun

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).

Pronunciation:

Arcturus

/ɑːkˈtjʊərəs/