separatrix
/sɛpəˈɹeɪtɹɪks/
"separatrix" is a 10-letter English headword indexed on PlainSpell.
The verdict
“separatrix” 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
- 10
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The ⟨L⟩ or pipe ⟨|⟩ mark formerly used to divide integers from decimals.
| Property | Value |
|---|---|
| Headword | separatrix |
| Language | English |
| Part of speech | Noun |
| IPA | /sɛpəˈɹeɪtɹɪks/ |
| Letters | 10 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “separatrix” sits in English frequency
Spelling & Dictionary Insight
The English entry for separatrix is 10 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /sɛpəˈɹeɪtɹɪks/. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 6 distinct senses for this headword, so context determines which meaning a reader should apply.
No misspelling variants are generated for separatrix in our index, since its letter pattern doesn't lend itself to common typo substitutions. This entry stands alone in our confusable dataset, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: Learned borrowing from Latin sēparātrīx, the feminine form of separator (originally owing to an implied līnea (“line”)), from sēparāre (“to divide; to separate”) + -trix (forming female agents). By surface analysis, separate + -trix. First developed as a de… The correct English form is separatrix, spelled S-E-P-A-R-A-T-R-I-X.
Definition
- 1The ⟨L⟩ or pipe ⟨|⟩ mark formerly used to divide integers from decimals.
- 2Synonym of decimal point, which replaced such marks.
- 3The proofreader's mark resembling a slash ⟨ / ⟩ or vertical bar ⟨ | ⟩ placed after a note in the margin to indicate that it should replace the item(s) struckthrough in the running text or to separate it from other margin notes.
- 4A terminator: a line on a partially-illuminated surface separating the lit and shaded regions.
- 5The line between regions having different magnetic fields.
- 6The boundary separating two modes of behavior in a differential equation.
Etymology
Learned borrowing from Latin sēparātrīx, the feminine form of separator (originally owing to an implied līnea (“line”)), from sēparāre (“to divide; to separate”) + -trix (forming female agents). By surface analysis, separate + -trix. First developed as a decimal mark among the medieval Arab mathematicians, whence a shorter variant gave rise to the decimal comma employed by many European countries and their former colonies.
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 “separatrix”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-E-P-A-R-A-T-R-I-X - every other letter order is a misspelling in standard orthography.
- Say it as /sɛpəˈɹeɪtɹɪks/ (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.