Arcturus Definition
ärk-to͝orəs, -tyo͝or-
noun
The fourth brightest star in the sky and the brightest star in the constellation Boötes, approximately 36 light years from Earth.
American Heritage
A giant, orange, variable star in the constellation Boötes, the brightest star in the N celestial sphere: magnitude, −0.05
Webster's New World
pronoun
(astronomy) A bright yellow-orange star in the constellation Boötes; Alpha (α) Boötis. It is the third brightest star in the night sky.
Wiktionary
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Origin of Arcturus
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