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Achernar
noun
Acher·nar
| \ ˈā-kər-ˌnär
\
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Definition of Achernar
astronomy
: a blue star with an apparent magnitude of about 0.50 that is the brightest star in the constellation Eridanus
Winding its way across the southern horizon is the lesser-known constellation Eridanus, also known as the “River Eridanus.” Ptolemy assigned 38 stars to this constellation, of which Achernar, located at the end of the “river,” is the ninth brightest star in the sky. — Denver Post, 15 Feb. 1996
— called also Alpha Eridani
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