Top Definition
Name of one of the three stars of Orion's belt also a large blue supergiant star in the constellation of Orion
It is the 30th brightest star in the sky (the 4th brightest in Orion) and is a blue-white supergiant. Together with Mintaka and Alnitak, the three stars make up the belt of Orion, known by many names across many ancient cultures. Alnilam is the middle star.
by ε Orionis January 16, 2014

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