noun Ras·al·ge·thi \ˈräs-ˌal-jə-ˈtē, -al-ˈge-thē\
variants: less commonly

Ras Algethi

\ˈräs-ˌal-jə-ˈtē, -al-ˈge-thē\

Definition of Rasalgethi


  1. :  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 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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of rasalgethi

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

First Known Use: 1780

Seen and Heard

What made you want to look up Rasalgethi? Please tell us where you read or heard it (including the quote, if possible).


a rounded knoll or a ridge of ice

Get Word of the Day daily email!