apoapsis
"apoapsis" is a 8-letter English headword indexed on PlainSpell.
The verdict
“apoapsis” is outside the top-ranked English vocabulary, used as a noun - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 8
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its maximum.
| Property | Value |
|---|---|
| Headword | apoapsis |
| Language | English |
| Part of speech | Noun |
| Letters | 8 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “apoapsis” sits in English frequency
Spelling & Dictionary Insight
The English entry for apoapsis is 8 letters long, classified as a noun. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its maximum.".
No generated misspelling entries exist for apoapsis in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. No confusable counterpart is on file for this word, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: From apo- + apsis. The correct English form is apoapsis, spelled A-P-O-A-P-S-I-S.
Definition
- 1The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its maximum.
Etymology
From apo- + apsis.
Synonyms
Antonyms
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “apoapsis”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is A-P-O-A-P-S-I-S - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.