Acher·​nar ˈā-kər-ˌnär How to pronounce Achernar (audio)
: 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

Word History


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, in the meaning defined above

Time Traveler
The first known use of Achernar was in 1679

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Dictionary Entries Near Achernar

Cite this Entry

“Achernar.” Dictionary, Merriam-Webster, Accessed 1 Mar. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!