noun ap·as·tron \(ˈ)a¦pastrən, -ˌsträn\

Definition of apastron



  1. :  the point in the orbit of one star of a binary where it is farthest from the other — compare periastron

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 apastron

New Latin, from apo- + Greek astron star — more at star

Seen and Heard

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


feeling or affected by lethargy

Get Word of the Day daily email!