apo·​apsis | \ ¦apō + \
plural apoapses or apoapsides\ " + \

Definition of apoapsis

: the apsis that is farthest from the center of attraction : the high point in an orbit — compare periapsis

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 apoapsis

1876, in the meaning defined above

History and Etymology for apoapsis

New Latin, from apo- + apsis

Keep scrolling for more

Learn More about apoapsis

Time Traveler for apoapsis

Time Traveler

The first known use of apoapsis was in 1876

See more words from the same year

Statistics for apoapsis

Cite this Entry

“Apoapsis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/apoapsis. Accessed 28 Feb. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster

Comments on apoapsis

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


Test Your Vocabulary

February 2021 Words of the Day Quiz

  • squirrel in winter
  • Which is a synonym of perdure?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

 AlphaBear 2

Spell words. Make bears.

Love words? Need even more definitions?

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