Ἀρκτοῦρος

English Wikipedia has an article on:

Arcturus

Wikipedia

Compound of ᾰ̓́ρκτος (árktos, “bear”) +‎ οὖρος (oûros, “guard”), in reference to its proximity to Ursa Major and Ursa Minor (the bear constellations).

Ᾰ̓ρκτοῦρος • (Arktoûros) m (genitive Ᾰ̓ρκτούρου); second declension

1. Arcturus, a bright star in the Boötes constellation.
   • 750 BCE – 650 BCE, Hesiod, Works and Days 566
   • 750 BCE – 650 BCE, Hesiod, Works and Days 610
   • Anaxag. 20
2. The time of Arcturus's rising (mid September).
   • 460 BCE – 370 BCE, Hippocrates, On Airs, Waters, and Places 10
   • 429 BCE, Sophocles, Oedipus the King 1137
   • 428 BCE – 347 BCE, Plato, Laws 844e
   • 460 BCE – 395 BCE, Thucydides, History of the Peloponnesian War 2.78

• Greek: Αρκτούρος (Arktoúros)
• Latin: Arctūrus
• → Russian: Аркту́р (Arktúr)

• “Ἀρκτοῦρος”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
• “Ἀρκτοῦρος”, in Liddell & Scott (1889) An Intermediate Greek–English Lexicon, New York: Harper & Brothers
• Ἀρκτοῦρος in the Diccionario Griego–Español en línea (2006–2024)
• Woodhouse, S. C. (1910) English–Greek Dictionary: A Vocabulary of the Attic Language‎, London: Routledge & Kegan Paul Limited, page 1,002