Achernar

noun
Acher·​nar | \ ˈā-kər-ˌnär How to pronounce Achernar (audio) \

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

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!

First Known Use of Achernar

1679, in the meaning defined above

History and Etymology for 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)

Keep scrolling for more

Learn More About Achernar

Time Traveler for Achernar

Time Traveler

The first known use of Achernar was in 1679

See more words from the same year

Dictionary Entries Near Achernar

achene

Achernar

Acheron

See More Nearby Entries 

Statistics for Achernar

Cite this Entry

“Achernar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Achernar. Accessed 4 Aug. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

TAKE THE QUIZ
Love words? Need even more definitions?

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