exo-
/ɛksoʊ-/
"exo" is a 3-letter English headword indexed on PlainSpell.
The verdict
“exo-” is outside the top-ranked English vocabulary, used as a prefix - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 4
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - outside; external
| Property | Value |
|---|---|
| Headword | exo- |
| Language | English |
| Part of speech | Prefix |
| IPA | /ɛksoʊ-/ |
| Letters | 4 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “exo-” sits in English frequency
Spelling & Dictionary Insight
The English entry for exo- is 4 letters long, classified as a prefix, and transcribed in the International Phonetic Alphabet as /ɛksoʊ-/. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.
exo- doesn't appear in our generated misspelling index, since its letter pattern doesn't lend itself to common typo substitutions. It is not paired with a close-neighbour confusable in our dataset, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From Ancient Greek ἔξω (éxō, “outer; external”). The correct English form is exo-, spelled E-X-O--.
Definition
- 1outside; external
- 2outside; external
Etymology
From Ancient Greek ἔξω (éxō, “outer; external”).
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 “exo-”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is E-X-O-- - every other letter order is a misspelling in standard orthography.
- Say it as /ɛksoʊ-/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- 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.