variants: or less commonly Ras Algethi \ ˈräs-​ˌal-​jə-​ˈtē , -​al-​ˈge-​thē \

Definition of Rasalgethi

: a group of stars of the third magnitude that is seen in the constellation Hercules Hercules resembles the constellation Orion but only has two stars along the belt (rather than three) and is not as bright as Orion but still recognizable. In Hercules, there is an interesting double star known as Rasalgethi, located above his head. — Chris Pagan, Tulsa World (Oklahoma), 5 June 2011

called also Alpha Herculis

Note: What is visible in the night sky as the star Rasalgethi is actually a group of three stars bound together gravitationally; one red giant and a binary system of a yellow giant and a yellow dwarf star.

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 Rasalgethi

1780, in the meaning defined above

History and Etymology for Rasalgethi

borrowed from New Latin, borrowed from Arabic ra’s al-jāthī, literally, “head of the kneeling one”

Learn More About Rasalgethi

Time Traveler for Rasalgethi

Time Traveler

The first known use of Rasalgethi was in 1780

See more words from the same year

Dictionary Entries Near Rasalgethi




See More Nearby Entries 

Statistics for Rasalgethi

Cite this Entry

“Rasalgethi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Rasalgethi. Accessed 28 Jun. 2022.

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


Test Your Vocabulary

Which Word Does Not Belong?

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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