Etymology
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Betelgeuse

alpha Orionis, bright reddish star in the right shoulder of Orion, 1515, from Arabic Ibt al Jauzah, traditionally said to mean "the Armpit of the Central One" (with this arm he holds his club aloft), but perhaps more accurately "Hand of al-Jauza (Orion)." Intermediary forms include Bed Elgueze, Beit Algueze.

updated on May 22, 2017

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Definitions of Betelgeuse from WordNet

Betelgeuse (n.)
the second brightest star in Orion;
Synonyms: Alpha Orionis
From wordnet.princeton.edu, not affiliated with etymonline.