Definition of Achernar
: 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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Origin and Etymology of achernar
borrowed from New Latin Achernar, Acharnar, going back to Medieval Latin Acarnar, transcription of Arabic ākhir an-nahr “end of the river,” rendering its Ptolemaic designation as the bright star at the end of the river (Eridanus)
First Known Use: 1679
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