Definition of Arcturus

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< arctic tern

arcuate >

Arc·tu·rus    (ärk-trs, -tyr-) KEY 

NOUN:

The fourth brightest star in the sky and the brightest star in the constellation Boötes, approximately 36 light-years from Earth.

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ETYMOLOGY:
Middle English, from Latin Arctrus, from Greek Arktouros : arktos, bear; see tko- in Indo-European roots + ouros, guard (from its position behind Ursa Major); see wer-³ in Indo-European roots