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Definition of Alioth
astronomy
: a variable star of the first magnitude that is seen in the handle of the Big Dipper and is one of the two brightest stars in that constellation Alioth, otherwise known as HD 112185, is a variable star with a very well-defined period, its brightness changing by 0.03 magnitude every 5.09 days. — Shireen Gonzaga, Astronomy, December 1991 —called also Epsilon Ursae Majoris
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First Known Use of alioth
1704
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