noun Astronomy.

  1. a first-magnitude star in the constellation Orion.


  1. the brightest star, Beta Orionis, in the constellation Orion: a very luminous and extremely remote bluish-white supergiant, a double star. Visual magnitude: 0.12; spectral type: B8I

bright star in Orion, 1590s, from Arabic Rijl Jauzah al Yusra “the Left Leg of the Central One,” from rijl “foot.”

  1. A very bright, bluish-white supergiant star in the constellation Orion. It is a binary star, with an average apparent magnitude of 0.12. Scientific name: Beta Orionis.
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